How much Durabak do I need for my RV?

In order to properly seal the roof of your RV you will need at least 2 coats of Durabak 18 Smooth applied over it.

Here's a handy table to help you work out how much smooth Durabak 18 you'll need.

Motorhome Length in feet	How many gallons?	Link to purchase
up to 8'	1 gallon	BUY
up to 16'	2 gallons	BUY
up to 24'	3 gallons	BUY
up to 32'	4 gallons	BUY
up to 40'	5 gallons	BUY
up to 48'	6 gallons	BUY

Choose a color

We recommend using polyurethane caulking to fill any holes and gaps and cracks more than a hair's breadth wide before applying the Durabak. You can also apply as many coats of Durabak as you like to seal corners and edges for a more robust and flexible seal - as soon as the last coat is touch dry you can apply another coat.

Application Guidelines for EPDM RV roof, also good for fiberglass:

Durabak is GREAT on Rubber; it flexes, stretches and moves with it!

Applying Durabak on Rubber is simple, if you follow these instructions carefully it will never come off!

Equipment

2 stipple roller sleeves per gallon (Included with purchase of textured gallon) or short nap roller, like a 3/16” mohair or similar for a smooth application.
40 grit Sandpaper
Xylene or Solvide
Stir stick or electric paint mixer
Roller Tray
Cloth or sturdy cotton rag
Paint Gloves
Household non-chlorinated detergent, like Spic n Span
3M Blue tape (Optional)
Paint Respirator (Optional)
Primer (Optional)

Surface Prep

Clean the surface thoroughly, with a non-chlorinated household detergent
Rough up the surface with 40 grit sandpaper
Wipe down the surface with xylene or Solvide on a cloth and once completely dry, apply the Durabak.

Application Process

Do not open can until surface is prepped and ready to go.
Then open can and stir well.
Pour a portion into a roller tray and begin application.
Roll on first coat of textured using Durabak stipple roller sleeve, or a short nap roller for the smooth Durabak.
Use a paint brush in corners and hard to reach areas.
Stir occasionally while working with the product.
Keep lid on can while not in use.

Coverage

1 gallon of smooth Durabak covers roughly 75-80 square feet in our standard 2 coat application.

1 gallon of textured Durabak covers approximately 60 square feet in our standard 2 coat application.

Good to Know

Durabak begins to cure with exposure to air, so minimize exposure to air while working with it.
The consistency of the Durabak should be runny, as it’s self leveling. If it’s thicker, you can add up to 15% xylene to thin it. It should be mixable after adding the xylene and back to a runny form. If it’s pasty and thick, DO NOT APPLY, rather reach out to us for assistance.
You will have a few hours of work time once the can is opened (3 to 5 hours normally).
A second coat can be applied after 1-2 hours, once the first coat is touch dry.
After second coat is applied allow 24 hours before walking on it. Complete cure is about 5 or 6 days, so no heavy use until then.

Additional Tips

Temp should ideally be 60 degrees or above for the application, and above 40% humidity.
Xylene should be applied immediately to clean up any misapplied Durabak.
If taping off, use 3M Blue tape and remove immediately after second coat is applied.