Dicor Self-Leveling Lap Sealant

Dicor Self-Leveling Lap Sealant is a staple maintenance product for RV and camper owners looking to prevent roof leaks and maintain seal integrity around vents, seams, and fixtures.

4.6

HitchHaven score4.6 out of 5 · our editorial rating

Self-leveling formula flows smoothly over horizontal RV roof seams
Compatible with EPDM, TPO, aluminum, fiberglass, and wood surfaces
Resists UV rays, ozone, and extreme temperature cycling
10.3 oz cartridge fits standard caulking guns
Remains flexible to prevent cracking as RV flexes during travel
Paintable once fully cured for seamless appearance

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Overview Specs Pros & cons Full review Related

The verdict

Dicor Self-Leveling Lap Sealant is a staple maintenance product for RV and camper owners looking to prevent roof leaks and maintain seal integrity around vents, seams, and fixtures. Its self-leveling formula makes application straightforward even for DIYers, while its flexibility and UV resistance ensure durability through seasons of travel. While it requires proper prep and patience during cure time, it remains one of the most reliable and affordable solutions for horizontal RV roof sealing.

Spec plate

Volume: 10.3 oz cartridge
Cure Time: 24-48 hours depending on climate
Application Temperature: 40°F to 100°F
Compatible Surfaces: EPDM, TPO, aluminum, fiberglass, wood
Color: White

Pros & cons

What we like

Easy to apply with standard caulking gun
Levels itself into seams reducing need for tooling
Long-lasting weatherproof seal against leaks
Works on multiple roofing and body materials
Trusted brand widely recommended by RV manufacturers
Affordable compared to full roof resealing

What to watch

Cures slowly in cold or humid weather
Can yellow slightly over time with UV exposure
Not suitable for vertical seams (non-sag version needed)
Shelf life is limited once opened
Requires thorough surface cleaning for proper adhesion

Full review

Dicor Self-Leveling Lap Sealant is a purpose-built roofing sealant designed specifically for RVs, travel trailers, and campers that feature horizontal surfaces where water runoff and ponding are common concerns. Unlike vertical sealants that stay put once applied, this formula is engineered to flow and settle smoothly across flat and gently sloped areas, automatically filling in gaps, seams, and uneven surfaces around roof vents, skylights, antennas, and lap seams. This self-leveling property eliminates the tedious tooling and smoothing that traditional caulks require, giving RV owners a professional-looking, weatherproof finish without specialized skills or tools. The sealant bonds effectively to aluminum, fiberglass, rubber roofing membranes like EPDM and TPO, and painted metal surfaces, making it a versatile choice for the mixed materials found on most recreational vehicle rooftops.

Maintaining a watertight RV roof is one of the most critical tasks in preventing costly interior damage, and Dicor Self-Leveling Lap Sealant addresses this need directly by sealing the horizontal seams and roof penetrations that are most vulnerable to water intrusion. Over time, sun exposure, temperature swings, and road vibration cause factory seals to crack, shrink, or pull away from fittings, and this sealant is formulated to resist those same environmental stressors once cured. It remains flexible after application, allowing it to expand and contract with the roof material through seasonal temperature changes without cracking or peeling, which is essential for RVs that travel through varied climates or sit stored outdoors year-round. Routine inspection and reapplication of this sealant around vents, air conditioner units, and seams is considered standard preventative maintenance for extending the lifespan of an RV roof system.

Application is straightforward enough for do-it-yourself RV owners, as the sealant can be applied directly from the tube using a standard caulking gun, then left to self-level into place without the need for extensive smoothing or tooling. It cures to a durable, UV-resistant finish that holds up against prolonged sun exposure, rain, and the general wear of travel, making it a dependable choice for seasonal maintenance checks or emergency repairs on the road. Many RV owners keep a tube on hand as part of their regular travel toolkit, since small cracks or separations in roof sealant can often be addressed quickly before they develop into larger leaks. Because it is widely compatible with the sealants originally used by major RV manufacturers, Dicor Self-Leveling Lap Sealant is frequently recommended as the go-to product for maintaining the integrity of rooftop seams and fittings throughout the life of the vehicle.

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