FAQs
Select an option below to see frequently asked questions and answers about the Flex Seal Family of Products.
Flex Paste
Flex Glue
Flex Tape
Flex Seal Spray
Super Glue
Duct Tape
FLEX PASTE™ FAQ
For an overview of product information and best practices:
Q: What is Flex Paste?
A: Flex Paste is a super thick rubberized paste that clings to the surface and instantly fills large gaps, cracks, and holes. Once dry, Flex Paste turns into a strong, flexible, watertight, rubberized coating that seals out air, water, and moisture on a variety of surfaces and objects.
Q: Is it important to read ALL the directions before using/opening my Flex Paste?
A: YES… to understand the best way to apply, use and preserve your Flex Paste, it’s important to READ ALL DIRECTIONS before use.
Q: What projects can I use Flex Paste for?
A: Flex Paste is perfect for DIY, handyman projects, arts & crafts, hobbies and so much more! Use it to repair your roof, winterize your home, plumbing repairs, to seal cracks, automotive or marine repairs, pool and spa repairs, and so much more.
Q: Can I use Flex Paste as a sealant?
A: YES, it is an excellent waterproof sealant. Flex Paste can be used on windows, doors, vents, thresholds and so much more. It will create a watertight barrier that seals out air and moisture. Use Flex Paste to help prevent flood damage. It can even be used to fill large voids to help keep insects and rodents out of your home.
Q: What surfaces can I use Flex Paste on?
A: You can use Flex Paste on a wide variety of surfaces such as wood, glass, tile, concrete, aluminum, metal, brick, stucco, masonry, copper, fabric, fiberglass, ceramic, porcelain, natural stones, roofing, PVC, EIFS, EPDM, CSPE, Hypalon polyurethanes, and some plastics and rubberized materials. We recommend testing in a small inconspicuous area before using.
Q: Can I use Flex Paste on a wet surface or underwater?
A: YES, Flex Paste can be applied on dry or wet surfaces and even underwater. It won’t dissolve or wash away and even dries underwater. For best results apply a generous amount to the surface using firm pressure. This will help push the water out and allow better contact to the surface during application. Etching the surface may help with adhesion on both wet and dry surfaces.
Q: Is Flex Paste chemical, UV, and mildew resistant?
A: YES, once fully cured, Flex Paste is UV, mildew, and chemical resistant.
Q: Will Flex Paste shrink?
A: NO, Flex Paste will not shrink, crack, or peel.
Q: : How do I apply Flex Paste?
A: Use a putty knife, trowel, or similar tools to remove a smooth even layer of material from the top of the tub. Scooping deeply into the tub may cause air pockets which can dry the Flex Paste. Apply a generous amount using a smooth sweeping motion. (See label instructions.)
Q: In what temperatures can I apply Flex Paste?
A: Flex Paste can be applied in a wide range of temperatures from 0°F – 150ۜ°F. Once applied and fully cured it can withstand a wider range of temperatures from -40°F – 200°F.
Q: Can I smooth or tool it once it has been applied?
A: Depending on temperature, humidity or the thickness of the layer, Flex Paste can be tooled within 15-30 minutes of the initial application. It will dry to the touch in approximately 2 hours and fully cure in 24 to 48 hours. Flex Paste gets stronger over time.
Q: How long should I wait to apply a second layer of Flex Paste?
A: Allow 24 hours to cure before applying additional coats if needed.
Q: How long does it take for the product to fully cure?
A: Depending on the thickness of the layer the product needs 24 – 48 hours to fully cure. Temperature and humidity levels will also impact the curing process. Humid environments will cure the product faster than dry environments. If the treated area is still wet or soft, it will need more time to cure.
Q: Once fully cured, does Flex Paste remain flexible?
A: YES, Flex Paste dries into a strong, flexible rubber that expands and contracts with the surfaces to which it’s adhered.
Q: How long does Flex Paste last?
A: With proper application, care and maintenance, Flex Paste will last for years.
Q: Can Flex Paste be painted?
A: YES, once fully cured, it can be painted any color.
Q: Can Flex Paste be sanded?
A: Unlike spackle or joint compound, Flex Paste dries to a waterproof, flexible rubber. Therefore, sanding may not be the best option once Flex Paste has cured. Instead of sanding we recommend using a putty knife, trowel, or similar tool to smooth over the surface of the Flex Paste to your desired finish. You can even add designs and patterns to Flex Paste to create your own unique artistic textures.
Q: Does it have an odor?
A: Flex Paste has a slight mild odor during application, but it dissipates as it cures.
Q: Can I dilute Flex Paste?
A: NO, Flex Paste is a ready to use product. Do not dilute with solvents or water.
Q: How do I remove Flex Paste?
A: Do not use water to clean Flex Paste. Before it cures, Flex Paste can be cleaned with a dry cloth. If necessary, most residues can be removed with acetone or mineral spirits. Application tools may also be cleaned with a dry cloth and with acetone or mineral spirits as needed. Once fully cured, Flex Paste can be removed with a sharp tool like a chisel or a putty knife. However, it may not be possible to remove it without damaging the surface.
Q: Is Flex Paste food grade/food safe?
A: Flex Paste has not been approved for use around foods.
Q: Can I use this on drinking water, rain barrels, fish tanks, etc.?
A: Flex Paste has not been tested for safe use on potable water sources or around plants and animals.
Q: How do I preserve Flex Paste?
A: Flex Paste begins to cure once exposed to air, moisture and humidity. To slow the curing process, keep the product covered with the lid during use. Secure the lid and store in a cool dry place when done. If your packaging has a protective foil on the surface of the Flex Paste, DO NOT DISCARD PROTECTIVE FOIL OR SILICA GEL PACKET and after each use, always replace the protective foil and the silica gel packet. Start by pressing the foil on the center of the surface of the product and continue pressing outwards so the foil remains in constant contact with the Flex Paste. Make sure no air pockets have formed between the foil and Flex Paste. Once you reach the edge of the tub, press the foil around the inside perimeter, keeping the excess foil facing up. Replace silica gel packet and secure the lid. Before use, always remove any dry material or skin that may have formed on the surface. Do not mix dry and fresh Flex Paste together in the tub.
Q: I lost my protective foil. What should I do?
A: Cut a piece of heavy-duty aluminum foil larger than the opening of the Flex Paste container by a ½ inch all the way around. Use it in place of the protective foil after each use.
Q: What is the recommended storage temperature for Flex Paste?
A: Store Flex Paste in temperatures from 60°F to 100°F.
Q: How much coverage does Flex Paste provide?
A: One pound of Flex Paste provides about 10 linear ft at 2 inches wide with a layer thickness of approx. 1/16th inch.
Q: In what sizes and colors can I purchase Flex Paste?
A: Flex Paste is offered in black or white and available in the following sizes:
9oz cartridge (caulking gun required)
1 lb. container
3 lb. container
12 lb. MAX container
Q: What is the maximum pressure Flex Paste can withstand?
A: There are a variety of factors that can impact the maximum pressure Flex Paste can withstand. Depending on the thickness of the layer applied, the surface type it’s being applied to, the size of the crack or hole to be sealed, Flex Paste will withstand a wide range of hydrostatic pressure. Always wait until the Flex Paste is fully cured before testing.
Q: Can I use this to repair a gasoline tank?
A: We do not recommend the use of Flex Paste to seal a gasoline tank or any other flammable liquid containers.
Q: Can Flex Paste be used with electrical wires?
A: Flex Paste has not been tested for this application and has no UL rating.
FLEX GLUE® FAQ
For an overview of product information and best practices:
Q: What is Flex Glue?
A: Flex Glue is an easy to use, super strong, waterproof adhesive bonds, seals, and repairs virtually everything, even underwater. Its thick, no run and no drip, formula make it exceptional for overhead applications.
Q: What is the difference between Flex Glue in the squeeze tube vs. the Pro Formula Cartridge?
A: All sizes have amazing instant grab technology, and our Pro Formula has even more instant grab.
Q: In what temperatures can I apply Flex Glue?
A: Flex Glue is best applied to surface temperatures from 0°F to 150°F. Once fully cured, Flex Glue can withstand temperatures from -40°F up to 200°F.
Q: Can I smooth or tool it once it has been applied?
A: Yes, Flex Glue can be tooled or re-positioned within 10 minutes of initial application. It will dry to the touch in 1 hour.
Q: How long does it take for the product to fully cure?
A: Flex Glue fully cures in 12-24 hours and reaches maximum strength in 7 days.
Q: Will Flex Glue shrink during the curing process?
A: Flex Glue will not shrink, crack, or peel.
Q: Will Flex Glue Clear retain its clarity once fully cured?
A: Yes, it dries to a crystal-clear bond.
Q: How do I clean up after using Flex Glue before it cures?
A: Before it cures, Flex Glue can be cleaned with a dry cloth. If necessary, most residues can be removed with isopropyl alcohol.
Q: Can I remove Flex Glue once it’s cured?
A: Once dried, Flex Glue can be removed with sharp tools like a chisel. However, it may not be possible to separate bonded materials without damaging the surfaces.
Q: Can Flex Glue be painted?
A: Yes, once fully cured, it can be painted.
Q: Can it be used on porous surfaces?
A: Yes, Flex Glue is designed to be super thick. It bonds to porous substrates such as brick, concrete, mortar and so much more.
Q: Can Flex Glue be used underwater?
A: Yes, you can apply Flex Glue underwater, and it will even cure underwater.
Q: Is Flex Glue UV, mold, and mildew resistant?
A: Yes, it is.
Q: Is Flex Glue food grade/food safe?
A: Flex Glue has not been approved for use around foods.
Q: Can I use it on drinking water, rain barrels, fish tanks etc.?
A: Flex Glue has not been tested for safe use on potable water sources or around plants and animals.
Q: : How do I help preserve Flex Glue?
A: After use, squeeze small bead from opening to form a plug & screw cap on tight. Remove the cured plug when it's time to re-use.
Q: What is the recommended storage temperature for Flex Glue?
A: Store Flex Glue in temperatures from 60°F to 100°
Q: How many linear feet can I get out from a tube of Flex Glue?
A: Depending on the thickness of the bead, Flex Glue will provide the following:
MINI 0.6 oz. (clear): up to 3 linear feet
MINI 0.75 oz. (white): up to 3.75 linear feet
4 oz. squeeze tube (clear): up to 20 linear feet
6 oz. squeeze tube (white): up to 30 linear feet
9 oz. Pro Formula (clear): up to 45 linear feet
10 oz. Pro Formula (white): up to 50 linear feet
28 oz. MAX (white): up to 140 linear feet
Q: In what sizes and colors can I get Flex Glue?
A: Flex Glue comes in .6 oz Clear Mini tube, .75 oz White Mini tube, 4 oz Clear tube, 6 oz White tube, 9 oz Clear cartridge, 10 oz White cartridge, and 28 oz White MAX cartridge.
FLEX TAPE® FAQ
For an overview of product information and best practices:
Q: What is Flex Tape?
A: Flex Tape is a super strong waterproof tape. It has a powerful adhesive with a thick flexible rubberized backing that conforms to virtually any shape and surface, even underwater.
Q: In what temperatures can I apply Flex Tape?
A: Flex Tape is best applied to surface temperatures from 20°F to 120°F. Flex Tape can withstand temperatures from -70°F to 200°F.
Q: What is the maximum pressure it can withstand?
A: The maximum pressure Flex Tape can withstand will vary based on the substrate and the conditions under which it is applied. It’s always best to test a small area first.
Q: If I’m using it to patch an above ground pool, is it best to apply it to the inside or the outside of the pool?
A: Both! Flex Tape forms a super strong bond with itself, so if you’re patching a pool, it’s best to first apply Flex Tape to the interior side of the pool wall and then place a second piece of Flex Tape to the exterior. Remember to cut your Flex Tape larger than the area of the leak. You do not need to drain the pool prior to applying it. Flex Tape is a temporary, emergency repair and is not meant to be a permanent fix.
Q: I’m trying to adhere it to fabric, but it’s not sticking. Is there anything I can do to prep the surface?
A: Flex Tape can be heated with a standard hair dryer to help the adhesive bond with the fabric. Also, continued firm pressure and time will help increase adhesion. Some customers have found it helpful to first prep a fabric surface with Flex Seal aerosol, let it dry, and then apply Flex Tape.
Q: Can I use it on a container that holds water for drinking?
A: It has not been tested on potable drinking water.
Q: Can I use it to repair an air mattress or inflatable?
A: Flex Tape can be used as a temporary, emergency repair to an air mattress or inflatable. However, it may not bond with all materials. Always test before use.
Q: Can I use it to repair a car or bicycle tire?
A: No. We do not recommend using Flex Tape to repair tires due to the extreme pressure.
Q: Can I use it on my radiator hose?
A: No. We do not recommend using Flex Tape on radiator hoses.
Q: Can I use it on a tank used to hold gas or oil?
A: No. We do not recommend using Flex Tape on a gas or oil tank.
Q: Can I paint over it?
A: Most paints will not adhere to Flex Tape. However, Flex Seal aerosol may be used as a primer to transform the appearance of surfaces where Flex Tape has been applied.
Q: What is the recommended storage temperature for Flex Tape?
A: Store Flex Tape in temperatures from 60°F to 100°F.
Q: In what sizes and colors can I get Flex Tape?
A: Flex Tape comes in Black, White, Clear, and Gray. The roll sizes come in Large (4” x 5’), Jumbo (8” x 5’), Giant (12” x 10’), MAX (4” x 25’), and MAX (8”x 25’).
FLEX SEAL® FAQ
For an overview of product information and best practices:
Q: What is Flex Seal Spray?
A: Flex Seal sprays out as a thick liquid, seeps into cracks and holes and dries to a watertight, flexible, rubberized coating that that stops leaks fast. Once dry, can be painted any color.
Q: In what temperatures can I apply it?
A: Flex Seal Spray is best applied to surface temperatures from 0°F to 100°F. Once fully cured, Flex Seal Spray can withstand temperatures from -20°F to 140°F.
Q: Can I apply it on a wet surface?
A: Flex Seal can be applied on a wet surface, or moist environment in the event of an emergency. However, it will always adhere better to a clean, dry surface. To ensure its longevity, we recommend you reapply Flex Seal once the area is completely dry.
Q: How long does it take to dry?
A: Dry time depends on the temperature, humidity, and thickness of the coating. Flex Seal will usually dry to the touch within 2 to 3 hours and fully cure in 24 hours. It will get stronger over time.
Q: How long will it last?
A: Depending on the environment, coats added, and maintenance, many people have found Flex Seal will last for years without cracking, peeling, or losing any of its strength or sealing properties.
Q: How much pressure will it withstand?
A: Flex Seal will withstand normal hydrostatic water pressure such as rainwater, but it is not made to withstand extreme pressure.
Q: How much will one can of it cover?
A: Depending on the number of coats and thickness, one MAX can will cover up to 15 sq. ft., one 14 oz. can will cover up to 12 sq. ft. and one MINI 2 oz. can will cover up to 2 sq. ft.
Q: Can I use Flex Seal Spray on vinyl pools and pool liners?
A: No, we do not recommend the use of Flex Seal Spray on vinyl.
Q: Can I paint it on or brush it on instead of spraying?
A: Yes, you can spray the Flex Seal directly into a bowl and paint it, brush it or roll it on any area.
Q: Is Flex Seal food grade/food safe?
A: Flex Seal has not been approved for use around foods.
Q: Can I use it to seal the inside of a water tank used for drinking?
A: No, we do not recommend that you use Flex Seal on surfaces where it comes in direct contact with drinking water.
Q: Can I use it to fix radiators, tires or other areas with extreme heat and pressure?
A: No, Flex Seal is not made to withstand extreme heat or pressure.
Q: Can I use it on a gasoline tank?
A: No, Flex Seal should not be used to seal a gasoline tank, oil tank or any other flammable material.
Q: What is the recommended storage temperature for it?
A: Store Flex Seal Spray in temperatures from 60°F to 100°F.
Q: Is Flex Seal Clear the same formula as Flex Seal Original and Brite?
A: In order to give Flex Seal Clear its amazing transparency, we had to make some adjustments to our formula. Therefore, the spray will be slightly thinner and additional coats may be required to get the job done.
Q: In what sizes is Flex Seal available?
A: : Flex Seal MAX comes in a 17 oz can in White, Black, Clear, and Gray. Our original cans are 14 oz and come in Almond, Black, Blue, Brite, Brown, Clear, Gray, Green, Red, White, and Terracotta.
Flex Super GlueTM FAQ
Q: What is Flex Super Glue?
A: Flex Super Glue is a high-performance, instant adhesive that bonds in seconds. It dries crystal clear to form a super strong, impact resistant bond that can be used on almost any material. It is perfect for quick repairs of plastic, metal, ceramic and more. Its precision nozzle allows you to make delicate repairs on just about anything around the home. Flex Super Glue is available in Liquid and Gel.
Q: What is the difference between the Liquid and the Gel Flex Super Glue?
A: The Flex Super Glue Liquid flows like water and is great for horizontal and non-porous surfaces. Flex Super Glue Gel’s thicker formula is great for vertical and porous surfaces. Once fully cured, both formulas have the same high-performance bond.
Q: Why do I need to shake the GEL bottle?
A: Flex Super Glue Gel is a thicker formula than a super glue liquid. Shaking the bottle pushes the settled glue to the tip of the nozzle. This allows for even and controlled dispensing.
Q: In what temperatures can I apply Flex Super Glue?
A: Flex Super Glue can be applied up to 200 degrees.
Q: How much Flex Super Glue should I apply?
A: We recommend one drop per square inch of surface being bonded. Excessive amounts of Flex Super Glue are not necessary and will reduce the overall performance and the glue.
Q: How long does Flex Super Glue take to set?
A: Flex Super Glue Liquid takes 5 to 45 seconds to set, depending on the surface being bonded and the amount of glue used. The Flex Super Glue Gel takes up to 45 seconds to set. Both formulas can take anywhere between 1 to 24 hours to fully cure.
Q: Will Flex Super Glue bond to plastics, vinyl, or rubbers?
A: Yes, Flex Super Glue bonds to Metal, Wood, Ceramic, Plastic, Paper, Leather, and so much more.
Q: Can I use Flex Super Glue on a wet surface or underwater?
A: No. The surface needs to be clean, dry, and free of oil or grease. Once fully cured, Flex Super Glue is water resistant.
Q: Can I paint over Flex Super Glue?
A: Yes. Once fully cured, Flex Super Glue can be sanded and painted.
Q: Can I use Flex Super Glue on a vertical surface?
A: Yes, we recommend the Flex Super Glue Gel for vertical surfaces. We recommend holding the object firmly to the surface, allowing Flex Super Glue up to 45 seconds to set. Flex Super Glue Gel could take anywhere between 1 to 24 hours to fully cure.
Q: Is Flex Super Glue food safe?
A: Flex Super Glue is not recommended to be used around food. It is also not recommended to be used on items that would go in the microwave, oven, dishwasher, refrigerator, or freezer.
Q: How do I remove Flex Super Glue from a surface?
A: Depending on the surfaces and volume of the product used, Flex Super Glue can be removed with Adhesive Remover. Fully cured Flex Super Glue could take anywhere between 1 to 24 hours to remove.
Q: What should I do if I get my fingers glued together?
A: If your fingers get glued together, you should immediately soak the bonded area in warm, soapy water. Carefully peel or roll the skin apart gently and slowly. DO NOT PULL APART. Flex Super Glue creates an extraordinarily strong bond that is nearly impossible to break by pulling straight up and down. If you gently roll the skin, you will gradually diminish the bonds between the Flex Super Glue molecules enabling your fingers to separate.
Q: How should I store Flex Super Glue?
A: Replace the cap immediately and store in a cool, dry place.
Q: What is the difference between Set and Cure time?
A: Set time is the time required for the initial bond of the surface to occur. Once set, bracing or holding should no longer be necessary. Cure time is the time it takes Flex Super Glue to reach full strength. Whenever possible, the repaired item should be left to cure overnight.
Q: In what sizes is Flex Super Glue available?
A: Flex Super Glue Liquid is available in squeeze tubes and bottles (either with a precision nozzle or brush applicator). Flex Super Glue Gel is available in squeeze tubes or bottles with a precision nozzle. Squeeze tubes and bottles come in varying sizes.
FLEX™ SUPER WIDE DUCT TAPE
Q: What is Flex Super Wide Duct Tape?
A: Flex Super Wide Duct Tape is no ordinary duct tape. It’s up to 300% wider than standard duct tape. It has a tough reinforced cloth backing with excellent abrasion resistance that’s water, weather, and UV resistant. It’s made with a powerful, thick, rubber adhesive that provides maximum bonding strength and can be torn by hand both horizontally and vertically, so there’s no waste.
Q: How is Flex Super Wide Duct Tape different from standard duct tape?
A: Flex Duct Tape has high elongation for conformability and offers better adhesion on uneven surfaces. Compared to the standard 1.88” duct tape, it is also up to 300% wider. It has a tough reinforced cloth backing with excellent abrasion resistance.
Q: At what temperatures can I apply Flex Duct Tape?
A: Flex Duct Tape can be applied at temperatures up to 200 Degrees.
Q: What surfaces can Flex Duct Tape be applied to?
A: Flex Duct Tape adheres to virtually all types of surfaces. It may not bond to certain siliconized material, water-repellent or some porous surfaces, such as raw unpainted wood, concrete, cinder block, and brick. The surface should be free of grease, oil, dirt, or debris.
Q: How do I apply Flex Duct Tape?
A: Before using Flex Duct Tape, the surface must be clean, dry, and free of any grease, oil, dirt, or debris. Use firm pressure and allow the tape to remain on the surface. Use your fingers, squeegee, or roller and press firmly to remove any creases, folds, or wrinkles. Firm pressure and surface time will increase bonding strength. Once applied, it resists accidental tearing.
Q: How do I unroll Flex Duct Tape?
A: Start at one corner of the tape and lift the edge of the tape up, then continue to pull until you get the desired length. Try not to let the tape fold in on itself as you unroll the amount you need.
Q: How do I tear Flex Duct Tape?
A: To tear, make sure your hands are dry. Firmly grab the area to be torn with both hands close together and quickly pull the tape apart, making sure the tape does not fold in on itself.
Q: Can I remove and reapply Flex Duct Tape?
A: Yes. Even though our powerful adhesive is super strong, it can still be removed and repositioned. Constant repositioning may eventually impact adhesion.
Q: How do I store Flex Duct Tape?
A: Store the product horizontally on its backing in a cool, dry environment. Avoid storing in an upright position.
Q: Is Flex Duct Tape water resistant?
A: Yes. Flex Duct Tape has a tough reinforced backing that is water, weather, and UV resistant.
Q: Can I apply Flex Duct Tape on a wet surface or underwater?
A: Flex Duct Tape is not intended to be applied on wet surfaces or continuously submerged underwater.
Q: Is Flex Duct Tape food safe?
A: Flex Duct Tape is not recommended to be used around food or in contact with drinking water.
Q: Can I paint over Flex Duct Tape?
A: Yes. Once applied, Flex Duct Tape can be painted over.
Q: Can I use Flex Duct Tape on fabric?
A: When applying to fabric, use firm pressure and allow the tape to remain on the surface for an extended period of time. Apply to both sides of the fabric when possible.
Q: How do I remove the duct tape residue?
A: Any remaining residue can be removed with Adhesive Remover.
Q: In what sizes and colors can I purchase Flex Duct Tape?
A: Flex Duct Tape comes in Black, White, and Gray. You can get rolls in either 4.6” x 20’ or 7.5” x 20’.
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