Dicor Non-Leveling Lap Sealant for RV Roofing, Ivory 10.3 oz — UV‑Stable Flexible Watertight Seal

Dicor 551LSV-1 Non-Leveling Lap Sealant is a flexible, sun-stable silicone-based sealant designed to create durable, watertight seals on RV roofs and related roofing materials.

Designed for RV roofing repairs and routine maintenance, this 10.3-ounce cartridge in an ivory shade provides a low-profile, color-matched finish that blends with light roofs. The formula was created primarily for EPDM applications but works on a wide range of substrates commonly found on recreational vehicles and mobile structures. It resists yellowing from sunlight, remains pliable after curing, and sticks tightly to metals, plastics, and masonry surfaces to help block water entry at seams, vent bases, and fasteners.

How does this sealant perform on different roofing materials?

Dicor 551LSV-1 was formulated with EPDM in mind but delivers reliable adhesion across many materials so you can use one product for several repair tasks. It bonds to rubber roofing, flexible membranes, and common RV construction materials without causing staining or surface damage.

• Compatible with EPDM, Dicor DiFlex II, Tufflex, PVC, and PriTEK TPO membranes
• Adheres well to aluminum, galvanized metal, wood, concrete, mortar, and vinyl
• Color-matched ivory minimizes visible touch-ups on light roofs
• Sun-ray stabilized to resist discoloration and surface deterioration

When and where should I apply this lap sealant on my RV?

Use this lap sealant anywhere a continuous, flexible barrier is needed to keep moisture out of the roof system. It’s ideal for sealing along lap seams, around vents and vent pipes, at screw heads, and along roof edges to prevent leaks that start at penetration points.

• Seal lap joints and membrane overlaps to maintain a continuous watertight surface
• Apply around roof vents, plumbing stacks, and HVAC bases to stop water intrusion
• Seal screw heads and fastener penetrations to prevent corroding and leaks
• Touch up minor splits or gaps where roofing meets trim or attachment points

Will the sealant stay flexible and visible after installation?

Yes — the product cures to a flexible bead that moves with thermal expansion and contraction, reducing the risk of cracks as the roof flexes. The ivory pigment is stabilized against UV exposure so the finish maintains an even color and won’t readily stain surrounding materials.

• Remains flexible after curing to follow roof movement and temperature changes
• UV-stabilized to reduce yellowing and maintain a consistent ivory finish
• Non-staining formulation safe on adjacent roof membranes and trims
• Provides a continuous barrier rather than a rigid seal that can detach

How should I prepare surfaces and apply the Dicor lap sealant?

Clean, dry, and degreased surfaces improve adhesion and longevity; remove loose material before applying the product. Use a standard caulking gun for controlled application, tooling the bead to ensure full contact with both sides of the seam or penetration for a watertight result.

• Clean area of dirt, oils, and loose debris; allow to fully dry
• Cut nozzle to desired bead size and use a caulking gun for steady flow
• Tool the sealant into the joint for full adhesion and smooth finish
• Follow manufacturer curing times before exposing to moisture or traffic

Who this product is for: Dicor 551LSV-1 is aimed at RV owners, mobile-home technicians, and professional roofers who need a reliable, flexible lap sealant for routine maintenance and repairs. It’s a practical choice for anyone who wants an easy-to-apply, sun-resistant ivory sealant that works across common RV roof membranes and structural materials to reduce leaks and extend roof life.