Liquid Rubber RV Lap Sealant — Self-Leveling Flexible Roof Sealer, White 4-Pack

Liquid Rubber RV Lap Sealant is a self-leveling, flexible white sealant formulated to create watertight seals around horizontal RV roof details like vents, skylights, and AC units.

When you need a dependable, easy-to-apply solution for small roof details on a motorhome or travel trailer, this self-leveling lap sealant is made to flow into and smooth over horizontal seams and penetrations, forming a durable waterproof barrier. Sold in a convenient 4-pack of 10 oz tubes, it covers typical RV detail work and pairs with Liquid Rubber seam tape and roof coatings for larger repairs or full roof protection.

How does the self-leveling formula simplify roof detail repairs?

The sealant is engineered to flow and settle on its own after application, reducing the need for tooling and delivering a smooth finished bead on horizontal surfaces. That self-leveling action helps minimize air pockets and ensures consistent contact around vents, skylights, and other low-profile roof hardware.

• Flows naturally to create an even, smooth seal without heavy tooling.
• Reduces the risk of gaps or voids under horizontal fittings.
• Ideal for low-angle or flat roof details where a level bead is essential.

What surfaces and roof components is this sealant best suited for?

This product is intended for horizontal roof details on RV roofs — like vent collars, AC housings, antenna mounts, and seam edges — and is compatible with many common roof materials when properly prepped. It is not designed for vertical sidewalls or as a structural gap filler.

• Compatible with EPDM, TPO, fiberglass, metal, aluminum, PVC, and ABS when cleaned and dried.
• Excellent for sealing around vents, skylights, and unit flanges on the roof plane.
• Not for use on silicone surfaces; existing silicone must be removed first.

How durable and flexible will the seal hold up to weather and movement?

The sealant forms a flexible, waterproof barrier that accommodates thermal expansion, contraction, and the vibration common to road travel. This flexibility helps maintain adhesion and prevents brittle cracking that can lead to leaks over time.

• Maintains elasticity through temperature changes to reduce stress at joints.
• Resists water intrusion while riding and parked, helping to prevent leaks.
• Works as a detail-grade product within a broader roof system for long-term reliability.

How much will a 4-pack cover and how should I apply it?

Each 10 oz tube yields roughly 22 linear feet at a 5/16-inch bead. A typical 30-foot RV typically uses about four tubes for detail sealing, which is why the 4-pack is a practical option for most owners. Application requires basic caulking tools and proper surface preparation for best results.

• Coverage: ~22 linear feet per 10 oz tube at a 5/16" bead; 4 tubes suit many 30 ft RVs for detail work.
• Apply with a standard caulking gun; cut nozzle and puncture inner seal before use.
• Prepare surface by cleaning and drying; remove any silicone and contaminants first.

Who is this for? RV owners, fleet managers, and DIY technicians who need a targeted, easy-to-apply solution for sealing horizontal roof details will find this product useful. It’s best for detail sealing around roof hardware rather than full seam replacement or filling large open gaps—use it as part of a complete roof maintenance plan alongside Liquid Rubber seam tape and roof coatings for broader repairs.