Dicor Self-Leveling Lap Sealant for RV Roofs — 25 Pack 10.3 oz White, HAPS-Free Flexible Watertight

Dicor 501LSW-25 is a HAPS-free, self-leveling lap sealant sold in a 25-tube pack that creates flexible, watertight seals on horizontal surfaces like RV roofs, vents, and screw heads.

This self-leveling lap sealant is formulated for EPDM roofing and designed to bond to many common materials used in recreational vehicles and building repair. The white, sun-ray-stabilized formula resists discoloration, remains flexible after curing, and is made to continuously seal seams and fasteners on horizontal applications. Each cartridge contains 10.3 ounces of product, and the 25-pack supplies enough material for multiple repairs or a full-season maintenance cycle.

How does this sealant perform on RV roofs and horizontal joints?

Dicor’s self-leveling formulation flows to fill gaps, creating smooth, continuous seals across lap joints and around fasteners. Because it levels before curing, it avoids tool marks and makes a neat, durable bead that resists pooling water and debris build-up.

• Self-leveling for smooth horizontal beads without tooling
• Maintains flexibility to accommodate thermal movement
• Sun-ray stabilized to minimize yellowing and surface degradation
• Non-staining to preserve surrounding materials

Will it stick to different roofing and RV materials?

Yes — this sealant is compatible with EPDM and works well with Dicor DiFlex II, Tufflex PVC, and BriTEK TPO membranes. It also provides reliable adhesion to many substrates commonly found on RVs and rooftops.

• Adheres to EPDM, PVC, and TPO roofing membranes
• Bonds to aluminum, galvanized metal, and vinyl trim
• Works on wood, mortar, fiberglass, and concrete surfaces
• Color-matched white to blend with light roof surfaces

How easy is it to apply and what should I expect during curing?

Application is straightforward with a standard caulk gun: cut the cartridge tip, puncture the inner seal, and lay a continuous bead along the joint. The product flows to fill irregularities on horizontal surfaces, then cures to an elastic seal that remains flexible through temperature cycling.

• Use standard 10.3 oz cartridge-compatible caulk guns
• Self-leveling reduces need for tooling after application
• Cures to an elastic, weather-resistant bead
• HAPS-free formulation for reduced hazardous air pollutants

How much coverage does a 25-pack provide for maintenance?

A single 10.3 oz tube covers several linear feet depending on bead width and depth; the 25-tube set is intended for larger maintenance projects or multiple small repairs. For routine RV roof maintenance, the pack supplies enough sealant for re-sealing perimeter laps, vents, and screw head areas across several vehicles or seasonal inspections.

• 10.3 oz per tube — coverage varies with bead size and joint depth
• 25 tubes ideal for fleet or comprehensive season maintenance
• Buy in bulk for consistent color match and performance across jobs
• Stores unused tubes in cool, dry place for future touch-ups

Who is this for? Dicor 501LSW-25 is geared toward RV owners, fleet maintenance teams, roof repair professionals, and DIYers who need a reliable, self-leveling sealant for horizontal surfaces. It’s a practical choice when you want a white, sun-stable finish that bonds to multiple substrates, reduces visible repairs, and provides long-lasting flexibility without harsh HAPS emissions. Choose this 25-pack when you need enough material for full-season upkeep, multiple vehicles, or larger projects that demand consistent sealing performance.