DIY Builds
Photo by Skylar Kang Pexels Logo Photo: Skylar Kang

How many years does Flex Seal last?

Q: How long does it last? A: Flex Shot will last up to 30 years and will not fade, dry, crack, yellow or deteriorate.

flexseal.ca - FAQ's I Flex Seal Products
Can I use concrete deck blocks instead of footings?
Can I use concrete deck blocks instead of footings?

Instead of using footings, adding a level of gravel will give you the drainage aspect you are looking for. You can then add a frame of wood that...

Read More »
Last updated Nov 17, 2021
What is cheaper CDX or OSB?
What is cheaper CDX or OSB?

Cost. If you are big on saving, then you would want to go with OSB since it is a cheaper version of CDX. However, in as much as CDX is more...

Read More »
Last updated Jul 22, 2018

Welcome to our FAQ section

To jump to a certain product, select an option below:

Flex Paste

Flex Glue

Flex Tape

Flex Seal Liquid

Flex Seal Spray

Flex Shot

FLEX PASTE FAQ

Q: Is it important to read ALL the directions before using/opening my Flex Paste?

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.

What is the largest portable shed you can buy?
What is the largest portable shed you can buy?

The largest portable building that 5 Star Buildings creates is 16' x 48'. A portable building of this size will give you approximately 705 square...

Read More »
Last updated Mar 6, 2021
Can my Neighbour take my land?
Can my Neighbour take my land?

Registered land For adverse possession after 13 October 2003, a neighbour does not automatically acquire land simply by occupying it. After 10...

Read More »
Last updated Jul 28, 2021
These are the Best Shed Plans!
These are the Best Shed Plans!

Comprehensive and Intuitive to follow. Build That Shed!

Learn More »
Promotion

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?

How long will shed last?
How long will shed last?

Vinyl Sheds: 25 to 30+ Year Lifespan One of the most popular shed types we build, vinyl sheds are our best option for the lowest maintenance and...

Read More »
Last updated Jan 26, 2022
What is the difference between a Shouse and a Barndominium?
What is the difference between a Shouse and a Barndominium?

While barndominiums were originally barns converted into homes, shouses are often standard single-family homes with an attached workshop. However,...

Read More »
Last updated Oct 3, 2018
Can I build my own shed?
Can I build my own shed?

Yes, with the right plans you can build your dream shed.

Learn More »
Promotion

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.

Back to top

FLEX GLUE FAQ

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.

Back to top

FLEX TAPE FAQ

flexseal.ca - FAQ's I Flex Seal Products
Why should you not stack wood next to your house?
Why should you not stack wood next to your house?

Termites, Carpenter Ants, and Beetles, are pests that could be living in your firewood. Most insects that are in that wood are no risk to humans,...

Read More »
Last updated May 17, 2021
How do you keep mold and mildew out of a shed?
How do you keep mold and mildew out of a shed?

Humidity level control Install a hygrometer to monitor the relative humidity levels. Run a dehumidifier to keep the humidity at optimum levels,...

Read More »
Last updated Nov 28, 2022
How do you create a cutting list?
How do you create a cutting list?

Create the Cut List Create a view of the assembly and create a parts list for it. Select the part list and apply the “Cut List” style to it. Right...

Read More »
Last updated Jul 28, 2020
Can I build my own shed?
Can I build my own shed?

Yes, with the right plans you can build your dream shed.

Learn More »
Promotion
How many types of sheds are there?
How many types of sheds are there?

Sheds come in many different shapes and sizes for many uses, but after all of the different uses and names, two basic types of sheds are considered...

Read More »
Last updated Apr 2, 2019