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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 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: In what sizes and colours can I purchase Flex Paste?
A: Flex Paste is offered in black or white and available in the following sizes:
9 fl. oz. (266 mL) cartridge (caulking gun required)
1 lb. (454 g) jar
3 lb. (1.36 kg) tub
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, ﬁbreglass, ceramic, porcelain, natural stones, roofing, PVC, EIFS, EPDM, CSPE, Hypalon polyurethanes and so much more.
Q: Can I use Flex Paste on plastic and rubberized surfaces?
A: Flex Paste adheres to a variety of surfaces. However, it may not adhere to certain plasticized or rubber surfaces. We recommend testing in a small inconspicuous area before using.
Q: How much coverage does Flex Paste provide?
A: One pound of Flex Paste provides about 10 linear ft (3.05 m) at 2 inches (5.08 cm) wide with a layer thickness of approx. 1/16th inch (0.16 cm).
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. It will help push the water out and allow better contact with the surface during application. Etching the surface may help with adhesion on both wet and dry surfaces.
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 seal cracks, repair your roof, winterize your home, plumbing repairs, 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: 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 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: Can I smooth or tool it once it has been applied?
A: Depending on the 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 do I preserve Flex Paste?
A: Flex Paste begins to cure once exposed to air, moisture and humidity. There's a protective foil on the surface of the Flex Paste to ensure a fresh and usable product. This protective foil helps keep air, moisture and humidity out of the tub. DO NOT DISCARD PROTECTIVE FOIL OR SILICA GEL PACKET!
After each use, always replace the protective foil and the silica gel packet.
Start by pressing the foil on the centre of the product's surface 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 the silica gel packet and secure the lid.
Before use, always remove any dry material or skin that formed on the surface. Do not mix dry and fresh Flex Paste 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 (1.25 cm) all the way around. Use it in place of the protective foil after each use.
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 cure fully?
A: The product needs 24 – 48 hours to cure fully, depending on the thickness of the layer. 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: Will Flex Paste shrink?
A: NO, Flex Paste will not shrink, crack or peel.
Q: Can Flex Paste be painted?
A: YES, once fully cured, it can be painted any colour.
Q: Can Flex Paste be sanded?
A: Flex Paste dries to a waterproof, flexible rubber, unlike spackle or joint compound. Therefore, sanding may not be the best option once Flex Paste cures. 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 unique artistic textures.
Q: Is Flex Paste chemical, UV and mildew resistant?
A: YES, once fully cured, Flex Paste is UV, mildew and chemical resistant.
Q: Does it have an odour?
A: Flex Paste has a mild odour during application, but it dissipates as it cures.
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, you can remove most residues 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, removing it may not be possible without damaging the surface.
Q: Can I dilute Flex Paste?
A: NO, Flex Paste is a ready-to-use product. Do not dilute with solvents or water.
Q: Can I use this to repair a gasoline tank?
A: We do not recommend using 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.
Q: In what temperatures can I apply Flex Paste?
A: Flex Paste can be applied in a wide range of temperatures from -17.7°C to 65.5°C. Once applied and fully cured, it can withstand a wider range of temperatures from -40°C to 93.3°C.
Q: How long does Flex Paste last?
A: Flex Paste will last for years with proper application, care, and maintenance.
Q: What is the maximum pressure Flex Paste can withstand?
A: Various factors 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 store Flex Paste in a hot garage or outside?
A: To increase the product's life, we recommend always replacing the foil and silica packet after each use and closing the lid tightly. Whenever possible, store your Flex Paste in a cool, dry place.
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 0.75 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
Q: Can Flex Glue be used underwater?
A: Yes, you can apply Flex Glue underwater, and it will even cure underwater.
Q: Can it be used as a sealant?
A: Flex Glue is an excellent sealant. It can fill large voids and is great for applications with uneven surfaces.
Q: Can Flex Glue be painted?
A: Yes, once fully cured, it can be painted.
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: Is Flex Glue resistant to mould and mildew?
A: Yes, it is.
Q: Is Flex Glue UV resistant?
A: Yes, it is.
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 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 24 – 48 hours and reaches maximum strength in seven days.
Q: In what temperatures can Flex Glue be applied?
A: For easy application, we recommend applying it in temperatures between -17.7°C – 65.5°C.
Q: What temperatures can Flex Glue withstand?
A: Once applied, it can withstand a wide range of temperatures from -40°C up to 93.3°C.
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 dry?
A: Once dried, Flex Glue can be removed with sharp tools similar to a chisel. However, it may not be possible to separate bonded materials without damaging the surfaces.
Q: Can I use it on drinking water, rain barrels, fish tanks etc.?
A: Flex Glue has not been tested on potable water sources.
Q: Will Flex Glue Clear retain its clarity once fully cured?
A: Yes, it dries to a crystal-clear bond.
Q: Will Flex Glue shrink during the curing process?
A: Flex Glue will not shrink, crack or peel.
Q: What temperature should I apply it?
A: Flex Tape can be applied in a wide range of temperatures, from -6.6°C to 48.8°C.
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: 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 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 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 a container that holds water for drinking?
A: It has not been tested on potable drinking water.
Q: What is the maximum pressure it can withstand?
A: The maximum pressure that 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: Can I use it to repair an air mattress or inflatable?
A: Although some customers may have success using Flex Tape on an inflatable or an air mattress, it's not designed for high-pressure applications.
Q: How much will one can of it cover?
A: Coverage will vary depending on the number of coats used and the type of surface you are applying Flex Seal Liquid to. However, our available sizes typically cover the following area:
1 Large 16oz – up to 18.75 sq. ft.,
1 Jumbo 32oz – up to 37.5 sq. ft.,
1 Giant Gallon – up to 150 sq. ft.
Q: What is the shelf life of FLEX SEAL LIQUID?
A: Flex Seal Liquid has a shelf life of 24 months when properly stored. Skin may form on the surface of the can remains open for an extended time. To avoid skinning over, remove the lid, use immediately and always replace the lid after each use. If skinning does occur, remove the top layer and use the product.
Q: Is it safe to use around plants and animals?
A: Yes, Flex Seal Liquid is safe around plants and animals (once fully cured).
Q: Will it expand and contract in the summer and winter?
A: Yes, Flex Seal Liquid stretches, stays flexible, expands and contracts.
Q: Can I use it on the inside of my rainwater barrel?
A: Yes, Flex Seal Liquid is safe on rain barrels (once fully cured).
Q: How much pressure will it withstand?
A: The maximum pressure Flex Seal Liquid can withstand will vary based on the surface and the conditions under which it is applied. It’s always best to test a small area first.
Q: What temperatures will it withstand?
A: Flex Seal Liquid has a wide temperature range from -62.2°C to 176.6°C. For best results, we recommend applying it to surfaces and substrates in temperatures between 0°C and 48.8°C.
Q: Can I dilute it?
A: Flex Seal Liquid is ready to use and should be used right out of the can. Do not dilute it with solvents or water.
Q: How do I clean it up?
A: You can clean up excess or spilled product with a dry cloth or paper towel and mineral spirits (BEFORE the liquid begins to cure). DO NOT USE water or alcohol-based solvents.
Q: Can I apply it on a wet surface or when it’s raining?
A: It’s always best to apply Flex Seal Liquid on a clean, dry surface free of grease and oil. If applied during heavy rain, some of the product may wash away. Therefore, we recommend applying it 24 hours before any heavy rain, hail or snowfall (if possible).
Q: Can I use it to repair a gasoline tank?
A: We do not recommend using Flex Seal Liquid to seal a gasoline tank or other flammable liquids.
Q: Can I paint it?
A: Flex Seal Liquid can not be painted over with most traditional paints once fully cured.
Q: Can I use it on underfoot applications?
A: No, we do not recommend using Flex Seal Liquid on underfoot applications.
Q: How long does it take to dry?
A: Dry time depends on the temperature, the humidity, and the 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 much will one can of it cover?
A: Depending on the number of coats and the thickness, 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: 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: Can I apply it on a wet surface?
A: Flex Seal can be applied on a wet surface or moist environment in an emergency. However, it will always adhere better to a clean, dry surface. We recommend you reapply Flex Seal once the area is completely dry to ensure its longevity.
Q: How long will it last?
A: Depending on the environment, the 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: Can I paint 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. However, we recommend using Flex Seal Liquid for these types of applications.
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: Is Flex Seal associated with GAF?
A: No, it is not affiliated with GAF and is not intended for use by Professional Roofers.
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 multiple coats may be required to get the job done.
Q: Can I use Flex Seal Spray on vinyl pools and pool liners?
No, we do not recommend the use of Flex Seal Spray on vinyl.
Q: Can I paint over Flex Shot once it cures?
A: No, Flex Shot will not accept a top coat of paint. You might consider using Flex Paste or Flex Glue to seal the area if painting is required.
Q: Can I apply it to a wet surface?
A: It’s best to apply Flex Shot to a clean, dry surface. Still, Flex Shot can be applied to a wet surface, but not in standing water.
Q: Can I use it in an enclosed space?
A: Yes, but it is recommended that Flex Shot be used in a well-ventilated area.
Q: Will it fade, dry, crack, yellow or deteriorate because of contact with household cleaners?
A: No, Flex Shot will not fade, dry, crack, yellow or deteriorate due to contact with household cleaners.
Q: How long does it last?
A: Flex Shot will last up to 30 years and will not fade, dry, crack, yellow or deteriorate.
Q: How many linear feet can I get out of one can of Flex Shot?
A: One can will cover up to forty (40) linear feet, depending on the thickness of the bead.
Q: Can I use it in a container that holds water for drinking?
A: Flex Shot has not been tested for use on potable water systems.
Q: Can I use it to fix tires or other areas with extreme pressure?
A: Flex Shot is not recommended for use in extreme pressure.
Q: Are the extension tubes reusable?
A: Yes, extension tubes are reusable. After using Flex Shot with the extension tube, you can leave the extension tube affixed to the can of Flex Shot.
Q: Can the extension tubes be cut to adjust the thickness of the bead?
A: Yes, the extension tubes can be cut to any size to produce the desired bead thickness.
Q: How do I remove the extension tube that’s attached to my can of Flex Shot?
A: The extension tube screws onto the top of the Flex Shot can and is removed by unscrewing it in a counterclockwise direction. Do NOT attempt to remove the extension tube by pulling or yanking it off.