Liquid Rubber RV Lap Sealant - Self-Leveling Roof Sealant for Vents, Skylights & Seams (White) 2-Pack

Overview

Liquid Rubber RV Lap Sealant is a self-leveling, white sealant designed for horizontal roof details on RVs and travel trailers. Its flow-by-design behavior helps it settle into joints, creating a smooth, waterproof layer with minimal effort. Some leveling during application is normal as the product seeks its own plane across flat roof areas.

Where to use

Best applied around horizontal features such as vents, skylights, AC units, antenna mounts, and roof seams. It is not intended for vertical surfaces, sidewalls, or filling existing gaps or cracks. This makes it a precise option for detail sealing on roof components where flexibility matters.

Flexible protection you can count on

The sealant forms a durable, flexible waterproof barrier that moves with your roof as temperatures change and the RV experiences road vibrations. This adaptability helps maintain a consistent seal over time, potentially reducing water intrusion at treated joints.

Part of a complete RV roof system

For larger movement areas or a full leak-resistant roof, pair this lap sealant with Liquid Rubber Seam Tape and Liquid Rubber RV Roof Coating. Using the products together helps create a cohesive detail-sealing system that covers multiple roof stress points.

Preparation and application

Prepare the surface thoroughly: apply only to clean, dry substrates. The sealant will not adhere to silicone, and any existing silicone must be removed before application. When prepared correctly, it is compatible with EPDM, TPO, fiberglass, metal, aluminum, PVC, and ABS.

Coverage, tips, and behavior

Coverage and handling details help you plan with confidence:

• Each 10 oz tube covers about 22 linear feet at a 5/16 inch bead.
• A typical 30 ft RV usually requires around 4 tubes.
• Apply using a standard caulking gun; after cutting the nozzle, puncture the inner seal before use.
• The self-leveling nature may cause flow and leveling during application, which is normal and part of its design.

What you gain

Expect a straightforward detail-sealing option that works with common roof materials and helps maintain a weather-ready look. While results depend on proper prep and compatible substrates, this sealant can be a practical part of routine RV roof maintenance without promising specific outcomes.