Directions & FAQs
READ ENTIRE DIRECTIONS PRIOR TO USE!
Click here for helpful hints and instructions on how to properly use Flex Paste.
DIRECTIONS: Protective clothing & eyewear are recommended. Do not shake or stir product. Surface must be free of grease, oil & dirt. Remove silica gel packet and slowly lift protective foil from the surface. Do not discard foil or silica gel packet!
• Using putty knife, trowel or similar tool, remove an even layer from the top surface.
• Do not scoop deeply into the tub as this may create air pockets.
• Apply a generous amount to the surface using a smooth motion.
• Etching the surface will increase adhesion.
• Sanding is not recommended, instead smooth to desired finish or add designs to create unique artistic textures.
• Always make sure all cracks & holes have been completely ﬁlled & cured before testing.
DRY TIME: FLEX PASTE begins to cure once exposed to air, moisture & humidity and will skin in 15 to 30 minutes. Allow each coat to dry before applying additional coats. FLEX PASTE cures in 24 to 48 hours and gets stronger over time.
CLEAN UP: Use a cloth with mineral spirits or acetone to clean your tools and work area. Do not use water.
PRESERVING FLEX PASTE: After each use, press the foil onto the center of the remaining material and continue pressing outward so the foil remains in contact with the material. As foil reaches the edge of the tub, press around the inside perimeter, keeping the excess foil up. Replace silica gel packet and secure the lid tightly. Before reuse, remove any dried material that may have formed on the inside perimeter of the tub or on the surface. Store in a humidity-controlled environment.
Frequently Asked Questions
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 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. jar
- 3 lb. 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, ﬁberglass, 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 at 2 inches wide with a layer thickness of approx. 1/16th inch.
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: 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: 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 instruction)
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 do I preserve Flex Paste?
A: Flex Paste begins to cure once exposed to air, moisture and humidity. To ensure fresh, usable product, there’s a protective foil on the surface of the Flex Paste. 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 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: 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: 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 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: 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 odor?
A: Flex Paste has a slight mild odor 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, 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: 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 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.
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: How long does Flex Paste last?
A: With proper application, care and maintenance, Flex Paste will last for years.
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 store Flex Paste in a hot garage or outside?
A: To increase the life of the product we recommend always replacing the foil and silica packet after each use and closing the lid tightly. Whenever possible, store your Flex Paste in cool dry place.