Dicor Self-Leveling Lap Sealant is a premium, ready-to-use roofing sealant designed for RV and mobile home roofing applications. Engineered to flow and settle into low-profile joints, it provides a durable, watertight seal that resists weathering, shrinkage, and cracking. This guide explains what Dicor self-leveling lap sealant is, where it should be used, how to prepare surfaces, proper application steps, curing times, safety considerations, and maintenance tips to help users achieve a long-lasting seal on rubber, fiberglass, and metal roof membranes.
What It Is And Where It Works
Dicor Self-Leveling Lap Sealant is a polyurethane-based, elastomeric sealant formulated to create a seamless, flexible bond on lap joints in roofing systems. It remains flexible after curing, tolerating thermal expansion and contraction typical of RV roofs. The product is specifically designed for horizontal roof seams and low-profile areas where a self-leveling compound can flow into irregularities. It adheres well to common RV roofing substrates including EPDM rubber, TPO, aluminum, and fiberglass, making it a versatile choice for many retrofits and factory installations.
Key Features And Benefits
- Self-leveling formula minimizes manual smoothing for a uniform appearance and reliable seal.
- Elastomeric and durable remains flexible to tolerate movement and temperature swings.
- Waterproof seal designed to resist rain, UV exposure, and weathering over time.
- Easy tooling can be smoothed with a sealing tool or wet finger for clean edges.
- Versatile adhesion to rubber, metal, and some composite roofing surfaces with proper surface prep.
Surface Preparation
Proper surface preparation is essential for maximum adhesion and longevity. Clean and dry surfaces remove dust, oils, waxes, and old sealants. For rubber and fiberglass roofs, remove loose granules and wipe with isopropyl alcohol to ensure a clean bonding surface. For metal or tougher substrates, etching or priming may be recommended, depending on the manufacturer’s guidelines. It is crucial to repair any structural defects or delamination before applying the sealant. Allow the surface to dry completely prior to application to prevent trapping moisture under the sealant.
Application Guidelines
Apply Dicor Self-Leveling Lap Sealant using a compatible caulk gun on a clean, dry surface in temperatures between 40°F (4°C) and 100°F (38°C). Supplied with an appropriate nozzle, squeeze steady beads along the lap seam. The self-leveling formula will flatten and fill gaps as it cures, but workers should use a smoothing tool or damp sponge to guide the flow and form a neat bead, especially at edge joints. After application, wipe away any excess material from adjacent surfaces to prevent staining. For best results, apply in dry conditions and avoid applying on surfaces scheduled to be painted within a short period unless the product is designed for paint compatibility.
Drying And Curing Times
Typical cure times depend on ambient temperature, humidity, and roof material. Light foot traffic on the cured sealant can occur after 24 hours, while full cure may take 48 to 72 hours. In cooler temperatures or high humidity, curing can extend beyond 72 hours. It is advisable to avoid prolonged exposure to water during curing and to ensure adequate ventilation when working in enclosed areas. Always refer to the product label for the most current cure-time guidelines and any substrate-specific recommendations.
Compatibility And Limitations
Dicor Self-Leveling Lap Sealant is designed for use on EPDM, TPO, metal, and fiberglass roof surfaces common in RVs. It adheres well to most clean, dry substrates but may require primer on certain materials or over previously cured sealants. It is not recommended for use on porous or highly textured surfaces without proper bonding agents. Avoid applying over silicone-based sealants, as adhesion may be compromised. Before large-scale projects, conduct a small test area to confirm adhesion and cure behavior.
Safety And Handling
Use protective gloves and eye protection when handling sealants. Work in a well-ventilated area to minimize exposure to fumes. If skin contact occurs, wash with soap and water; if irritation develops, seek medical advice. Do not ingest. Keep out of reach of children. Store containers in a cool, dry place away from direct sunlight and extreme temperatures. Follow all label instructions for disposal and cleanup. For cleanup before curing, use mineral spirits or isopropyl alcohol as recommended on the product label.
Common Application Issues And Troubleshooting
- Poor adhesion can be caused by surface contaminants or moisture. Re-clean and re-prime as needed.
- Inadequate leveling may result from applying in overly warm or windy conditions. Apply during moderate temperatures and protect from drafts.
- Cracking or shrinking usually indicates premature curing due to moisture exposure or applying too thick a bead. Rework with a fresh bead after proper surface prep.
- Staining on adjacent materials may occur if tooling is not performed promptly. Use a damp tool to minimize edge specks.
A Quick Guide To Application Diagrams And Tools
To help with precision, a simple checklist can improve results:
- Prepare and dry the surface thoroughly.
- Mask the edges to keep lines clean.
- Cut nozzle to desired bead size for consistent flow.
- Apply and immediately tool the bead for an even finish.
- Wipe excess material from adjacent areas before curing begins.
Maintenance And Longevity
Routine inspection of RV roof seams ensures early detection of wear or potential leaks. Reapply sealant in sections showing signs of cracking, lifting, or weathering. If a roof coating or membrane is re-coated, reseal experienced laps according to the manufacturer’s guidelines. Periodic cleaning with mild soap and water can reduce debris buildup that could affect adhesion. Replace or refresh sealant adjacent to running water or vents when wear is evident to prevent water intrusion.
Where To Buy And How To Choose
Dicor Self-Leveling Lap Sealant is commonly available at RV supply stores, home improvement retailers, and online marketplaces. When choosing this product, verify the product code, viscosity, and compatibility with your roof substrate. Read current customer reviews to understand performance on similar roof materials and climates. For large installations, consider purchasing in bulk and storing in a cool, dry place to maintain sealant integrity over time.