Can it be used on a vertical RV surface?

No. It is self-leveling, so it flows and sags on slopes and vertical edges. Use a non-sag lap sealant there.

Which roof materials does it bond to?

EPDM rubber, TPO, fiberglass, wood, aluminum, steel and masonry. Clean and dry the surface first.

How much area does one tube cover?

It depends on bead size. A 1/4-inch bead covers more length than a 3/8-inch bead, and large roofs usually need more than one tube.

Does it need a caulking gun?

Yes. The 10.1 fl oz tube fits a standard caulking gun and lays a 1/4-inch or 3/8-inch bead.

Can it be applied over old sealant?

Only over clean, sound, fully cured sealant. Remove loose or cracked material first or the new layer will not bond.

Is it a repair or a full roof coating?

It is a lap sealant for seams, vents and edges. It does not replace a roof membrane or a full coating.

Where is the Self-Leveling RV Roof Lap Sealant cheapest?

At eBay, for $21.09, as of our latest check.

What do buyers say about the Self-Leveling RV Roof Lap Sealant?

Rated 4.1 out of 5 from 15 ratings.

Where can I buy the Self-Leveling RV Roof Lap Sealant?

2 stores we checked sell it, including eBay, Walmart.

Certain seal

Self-Leveling RV Roof Lap Sealant

Best price now

$21.09at eBayChecked Nov 9

Compared across 2 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission.

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What reviewers say

4.1 / 515 ratings

Buyers who rated it give it credit for flowing out smooth and setting up fast on flat roof sections. Complaints center on tube size for bigger jobs and on the mess when it is used on anything but a level surface.

What people mention

Self-leveling flowPraisedOwners say it settles into gaps and seams on its own and leaves a smooth bead.
AdhesionPraisedBuyers report it sticks well to EPDM, fiberglass and metal when the roof is cleaned first.
Cure timePraisedReviewers note it skins over quickly, letting them finish a repair in one session.
Tube sizeCriticisedSome say one tube covers little and larger roofs need several.
Sloped surfacesCriticisedIt runs or sags when applied anywhere but a flat area, so vertical edges need a different product.
Surface prepMixedResults depend heavily on a clean, dry, oil-free roof; some buyers had adhesion trouble without it.

About the Self-Leveling RV Roof Lap Sealant

Protect your RV from costly leaks with Certain Seal Self-Leveling RV Roof Sealant, an easy-to-use solution designed for DIY RV owners and weekend maintenance projects. Whether you're sealing around roof vents, vent pipes, skylights, or roof edges, this self-leveling formula spreads smoothly to create a durable, watertight seal with minimal effort. Perfect for quick repairs or routine maintenance, the self-leveling design automatically settles into gaps and seams, helping you achieve professional-looking results—even if it’s your first RV roof repair. The fast-curing formula allows you to finish projects quickly so you can get back to enjoying your RV. Certain Seal’s multi-surface formula bonds securely to common RV roofing and construction materials, including EPDM rubber, TPO, fiberglass, wood, aluminum, steel, and masonry, making it a versatile must-have for any RV owner’s tool kit. The convenient 10.1 fl. oz (300 mL) tube fits standard caulking guns and allows for 1/4" or 3/8" bead application, giving you the flexibility to tackle small touch-ups or larger sealing jobs. Proudly made in the USA, Certain Seal delivers reliable protection you can trust for your RV roof maintenance. Key Features: DIY-friendly self-leveling sealant for RV roof repairs and maintenance Ideal for roof vents, vent pipes, skylights, and roof edges Self-leveling formula creates a smooth, watertight seal Fast curing and easy to apply with a standard caulking gun Compatible with multiple surfaces: EPDM, TPO, fiberglass, wood, aluminum, steel, and masonry Dual bead options: 1/4" or 3/8" application Color: White Size: 10.1 fl. oz (300 mL) tube Made in the USA