Dicor Self-Leveling Lap Sealant for RV Roofs — White 4-Pack, Flexible Water-Resistant

Dicor 501LSW-1 is a self-leveling, white lap sealant designed to form a flexible, water-resistant secondary seal along roof seams, vents and fasteners.

Whether you’re sealing an RV roof, patching flashing, or caulking around vents and screw heads, this self-leveling lap sealant offers a workable, clean white finish that bonds to many common roofing materials. Supplied as a 4-pack, each tube is formulated for long-term performance when stored properly; the manufacturer’s production date is printed on the tube (this is not an expiration date). Store between 55–85°F in a dry place to maintain shelf life. Note: the item expires 2 years after the manufacturer’s stamped date.

How will Dicor 501LSW-1 perform on my RV roof seams?

It creates a flexible secondary barrier that bridges gaps and prevents moisture intrusion at lap joints. The self-leveling formula settles smooth for a neat appearance and reduces the need for tooling.

• Forms a contiguous seal over lap joints and fasteners
• Self-leveling to minimize ridges and gaps
• White color blends with most roof surfaces and reflects light

What materials does this sealant stick to?

Dicor 501LSW-1 adheres firmly to a broad range of substrates commonly found on RVs and buildings. It’s compatible with popular roofing membranes and rigid surfaces, making it versatile for repair and maintenance tasks.

• Adheres to aluminum, galvanized metal and fiberglass
• Compatible with EPDM and TPO roofing membranes
• Works with wood, concrete, vinyl and mortar surfaces

How should I store and how long will it last?

Store tubes in a dry location away from extreme temperatures to preserve usability. The stamped production date is for reference; under proper storage conditions the sealant remains usable until two years after that date.

• Ideal storage temperature: 55–85°F (13–29°C)
• Keep out of direct sunlight and freezing conditions
• Item expires 2 years after the manufacturer’s stamped date

How do I apply the lap sealant for best results?

Apply to clean, dry surfaces, cut the nozzle to suit gap size, and allow the sealant to self-level—no heavy tooling required. For long runs, work in manageable sections and permit proper cure time before exposing to water.

• Clean surface of dirt, oil and loose material before application
• Use a standard caulk gun and cut nozzle to desired bead size
• Allow manufacturer-recommended cure time before water exposure

Who is this for: Dicor 501LSW-1 is aimed at RV owners, professional roofers and DIYers who need a reliable, white, self-leveling lap sealant for sealing roof seams, vents and fasteners. If you work with EPDM or TPO membranes, metal or fiberglass roofing, and you want a neat, flexible secondary seal that adheres to many substrates, this 4-pack offers multiple tubes for ongoing maintenance and repairs.