Dicor RV roofing lap sealant 551LSG-1, Grey 10.3 oz — flexible, weather-resistant EPDM-compatible sealant

Dicor 551LSG-1 Non-Leveling Lap Sealant is a grey, weather-resistant roofing sealant designed to create flexible, watertight seals around seams, vents, and fasteners on RV roofs and other roofing substrates.

This 10.3-ounce cartridge of Dicor lap sealant is formulated for use with EPDM roofing but adheres well to many common roofing materials including Dicor DiFlex II, Tufflex, PVC, and PriTEK TPO. It also bonds to aluminum, mortar, wood, vinyl, galvanized metal, and concrete, making it a practical choice for repair and maintenance tasks where a reliable flexible seal is required. The grey color is matched to blend with common RV roof finishes and is engineered not to stain or yellow on applied surfaces.

How does Dicor lap sealant protect roof edges and vent areas?

The sealant forms a continuous bead that fills gaps and covers fastener heads to prevent water intrusion at vulnerable points. Its flexible formulation maintains adhesion through temperature swings and roofing movement, preserving the integrity of the roof assembly.

• Creates a watertight bead along roof edges and lap seams
• Seals around vent pipes, air vents, and screw heads
• Maintains flexibility to accommodate expansion and contraction

Will this product work with my RV’s roofing material?

Dicor 551LSG-1 is formulated primarily for EPDM but is compatible with a wide range of roofing membranes and substrates. It offers reliable adhesion to many materials, making it suitable for repairs on different roof types found in RVs and similar applications.

• Compatible with EPDM, Dicor DiFlex II, Tufflex, PVC, and PriTEK TPO
• Adheres to metal, vinyl, concrete, and wood surfaces
• Color-matched grey reduces visible repair contrast

How long does the lap sealant last and what maintenance is required?

When applied correctly to clean, dry surfaces, the sealant resists discoloration and is formulated to remain flexible over time. Routine inspections after severe weather and periodic reapplication where wear is observed will keep the roof watertight.

• Engineered to resist staining and maintain color over time
• Retains flexibility for continued adhesion through temperature changes
• Inspect seals annually and reapply where cracking or shrinkage appears

How should I apply Dicor 551LSG-1 for best results?

Surface preparation is key: clean, dry, and free of oils or loose materials before applying a continuous bead. Use a standard caulking gun for controlled application and tool the sealant to achieve full contact with the seam or fastener area.

• Clean and dry surfaces before application
• Apply with a caulking gun and tool the bead for a smooth finish
• Allow proper curing time per manufacturer guidelines before exposure

Who is this for? Dicor 551LSG-1 Non-Leveling Lap Sealant is aimed at RV owners, fleet operators, and maintenance professionals who need a dependable, flexible seal for roof seams, vents, and fasteners. It’s also useful for general roofing repairs on trailers, lightweight structures, and areas where a color-matched, long-lasting seal is preferred. Choose this product if you want a versatile sealant that bonds to many substrates and helps preserve the appearance and performance of roofing systems.