Can I use it on vertical seams or side windows?

No. It is self-leveling and designed for flat, horizontal roof surfaces, so it runs on vertical seams. Use a non-sag sealant for the sides and windows.

How long before I can paint over it?

Wait 24 hours after application. Full cure strength develops over about 7 days.

What temperature does it need to apply?

The surface must be at least 50°F (10°C). It skins over in about 45 minutes at 77°F and 50% humidity.

How much movement can the cured seal take?

Elongation at break is 300%, so the cured seal stretches with roof movement. It stays serviceable from about -50°F to 219°F.

Does it work on EPDM and TPO roofs?

It is made for RV roof seams and fittings on flat roofs. Check compatibility with your specific membrane before covering a large area.

The tube or container of sealant. A standard caulking gun is needed to apply it and is not included.

Where is the RV Lap Sealant cheapest?

At Liquid Rubber, for $49.95, as of our latest check.

What do buyers say about the RV Lap Sealant?

Rated 3.8 out of 5 from 11 ratings. Buyers like: Easy to use; Keeps the inside of the RV dry; Looks great.

RV Lap Sealant

Best price now

$49.95at Liquid RubberChecked Nov 9

Prices are checked against each store and labelled with when.

Visit Liquid Rubber

RV Lap Sealant

Best price now

$49.95at Liquid RubberChecked Nov 9

Prices are checked against each store and labelled with when.

Visit Liquid Rubber

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Price facts

Last seen at $49.95 at Liquid Rubber on Nov 9.

Our take on the RV Lap Sealant

A self-leveling, moisture-curing lap sealant for flat horizontal RV roof surfaces: seams, vents, skylights and roof joints. It cures into a flexible white membrane that stretches with temperature swings and road vibration, and it is low-VOC and low-odor, so it can be used in enclosed spaces. It applies from a standard caulking gun and skins over in about 45 minutes, but it needs 24 hours before painting and about 7 days to reach full cure strength. It suits DIY owners resealing a flat roof; for vertical seams and side windows, a non-sag sealant is the right tool instead.

Best forDIY RV owners resealing a flat roofVents, skylights and roof seams on horizontal surfacesOwners who want a low-odor, low-VOC sealantFlexible sealing that moves with the roof

Pros

Self-leveling formula flows out for a neater finish
Flexible cured membrane handles temperature swings and road vibration
Low odor and 16 g/L VOC, usable in enclosed spaces
Applies with a standard caulking gun
Stays workable long enough to spread, skins in about 45 minutes

Cons

Only for flat, horizontal surfaces; it runs on vertical seams
Needs 24 hours before painting and about 7 days for full cure strength
Minimum application temperature of 50°F limits cold-weather work
White color only, which may not match every roof

RV Lap Sealant prices at every store

Liquid RubberNew
In stockShips from Canada · duties may applyReturn policy
$49.95Checked Nov 9
Visit Liquid Rubber

What reviewers say

3.8 / 511 ratings

Buyers with 11 ratings average 3.8 out of 5. Those who like it call it easy to apply and say it keeps the inside of the RV dry and looks good.

What people mention

Ease of usePraisedBuyers say it goes on easily from a standard caulking gun.
Leak sealingPraisedOwners report it keeps the inside of the RV dry.
AppearancePraisedBuyers say the finished seal looks great.
Overall receptionMixedThe 3.8 out of 5 average shows satisfaction is not unanimous.

From Liquid Rubber

Seals vents and skylights on your RV roof
Self-leveling formula flows for neater application
Safe indoors and outdoors
Low odor, no harsh fumes; use in enclosed spaces
Apply and walk away
Easy application with a standard caulking gun

Sizes: 10oz (296ML) cartridge, 2 x 10oz (296ML) cartrid, 4 x 10oz (296ML) cartrid
Returns: Free returns
Shipping: Free shipping on US orders over a stated amount; US delivered in 3-5 business days, Canada in 3-7 business days
Packs: Single 10oz cartridge, 2-pack and 4-pack of 10oz cartridges

About the RV Lap Sealant

RV Lap Sealant is a self-leveling, moisture-curing sealant for waterproofing RV roofs. It is applied with a standard caulking gun to roof seams, vents, skylights and roof joints. It is designed for flat, horizontal roof surfaces.

The formula cures into a flexible, waterproof barrier that moves with the RV through temperature changes and road vibrations.

Color: White
Use on: Roof seams, vents, skylights and roof joints on flat, horizontal surfaces
Application: Standard caulking gun
Modulus 100%: 0.50 MPa
Tensile strength: 1.33 MPa
Elongation at break: 300%
Lap shear: 130 psi
Service temperature: -45.5°C to 104°C
Skin formation: 45 minutes at 25°C and 50% RH
Paintable after: 24 hours
Min. application temp: 10°C / 50°F
Cure strength: Develops over 7 days
VOC content: 16 grams per liter

What buyers say

Buyers like

Easy to use
Keeps the inside of the RV dry
Looks great

Specifications

Color: WhiteSource
Modulus 100%: 0.50 MpaSource
Tensile Strength: 1.33 MpaSource
Elongation at Break: 300 %Source

Questions and answers

Can I use it on vertical seams or side windows?: No. It is self-leveling and designed for flat, horizontal roof surfaces, so it runs on vertical seams. Use a non-sag sealant for the sides and windows.
How long before I can paint over it?: Wait 24 hours after application. Full cure strength develops over about 7 days.
What temperature does it need to apply?: The surface must be at least 50°F (10°C). It skins over in about 45 minutes at 77°F and 50% humidity.
How much movement can the cured seal take?: Elongation at break is 300%, so the cured seal stretches with roof movement. It stays serviceable from about -50°F to 219°F.
Does it work on EPDM and TPO roofs?: It is made for RV roof seams and fittings on flat roofs. Check compatibility with your specific membrane before covering a large area.
What is in the box?: The tube or container of sealant. A standard caulking gun is needed to apply it and is not included.
Where is the RV Lap Sealant cheapest?: At Liquid Rubber, for $49.95, as of our latest check.
What do buyers say about the RV Lap Sealant?: Rated 3.8 out of 5 from 11 ratings. Buyers like: Easy to use; Keeps the inside of the RV dry; Looks great.