Dicor 551LSV-1 HAPS-Free Non-Leveling Lap Sealant

Dicor 551LSV-1 is a HAPS-free, non-leveling lap sealant designed to form long-lasting, flexible watertight seals on RV roofs, flashings, and common roof penetrations.

Built for RV maintenance and professional roofing work, this ivory-colored lap sealant bonds to EPDM and many other roofing substrates while remaining flexible and UV-stable. Formulated to resist discoloration and keep joints sealed, the product is offered in a convenient 10.3-ounce cartridge for targeted repairs and trim work where a non-sagging compound is required.

How does Dicor lap sealant perform on different roof materials?

Dicor 551LSV-1 is formulated primarily for EPDM but is compatible with a broad spectrum of roofing surfaces, making it practical for mixed-material repairs. It adheres well to metals, vinyl, concrete, and many synthetic roof membranes, so you can use it around vents, screws, and trim without switching products.

• Designed for EPDM and works with Dicor DiFlex II, Tufflex, PVC, and PriTEK TPO
• Adhesion to aluminum, galvanized metal, wood, vinyl, mortar, and concrete
• Non-leveling formula won’t sag on vertical seams or angled flashings
• Color-matched ivory finish reduces visible touch-up contrast

What makes this sealant suitable for long-term outdoor exposure?

The compound is sun-ray stabilized to resist yellowing and surface spoilage from UV exposure, extending visual and functional life on exposed roof areas. It remains flexible after curing, which helps the seal accommodate thermal movement and vibrations common on RV roofs.

• UV-stable pigments prevent discoloration and streaking
• Flexible cured sealant tolerates expansion and contraction
• Continuous sealing property prevents water intrusion at seams
• Formulation minimizes staining on adjacent materials

Where should I apply Dicor 551LSV-1 on my RV or roof?

Use this lap sealant to seal roof edges, around air vents and plumbing stacks, and over screw heads and trim where a watertight joint is needed. Its non-sagging consistency makes it ideal for vertical and overhead repairs, and the 10.3 oz cartridge fits standard caulking guns for controlled application.

• Seal roof edge laps and flashing overlaps
• Seal around air vents, vent pipes, antennas, and skylights
• Cover screw heads and fastener areas to prevent leaks
• Touch-up seams and trim on mixed-material roof systems

How do I use and maintain the cured sealant?

Apply to clean, dry surfaces with a standard caulking gun and tool the bead as needed; no special primers are required for most substrates listed by the manufacturer. After curing, the seal remains flexible; inspect periodically and reapply if gaps, cracking, or adhesion loss appears.

• Surface must be clean, dry, and free of loose debris or oil
• Cut nozzle to desired bead size and apply with caulking gun
• Tool bead within manufacturer’s working time for neat finish
• Allow full cure before subjecting to water or heavy movement

Who this product is for: Dicor 551LSV-1 is aimed at RV owners, mobile-home and light-commercial roof technicians, and DIYers who need a reliable, non-sagging lap sealant for roof edges, penetrations, and trim repairs. It’s especially useful when working on EPDM and common synthetic roof systems where UV stability and material compatibility matter. Choose this 10.3-ounce ivory cartridge when you want a color-matched, long-lasting seal that’s easy to apply in tight or overhead spots.