100% Silicone Roof Sealant 5 Gallon - Self Leveling One Coat

In this review the 5 gallon 100% Silicone Roof Sealant is evaluated for RV owners, commercial building managers, and anyone needing a long-term waterproof roof solution. The bottom line: this product is best for users who want a single-coat, highly reflective membrane that resists UV and ponding water. The reviewer found the silicone easy to apply and quick to level, making it a practical solution for projects where time and durability matter; it consistently performed as a reliable leak prevention coating in varied roof applications.

Key Features

• 100% Silicone: Provides a durable, flexible membrane that resists UV degradation and remains stable under ponding water.
• Single Coat Application: Saves time and labor since one full coat can form the needed waterproof barrier for many roof types.
• Complete Waterproofing: Creates a continuous, self-leveling layer that prevents leaks without shrinking over time.
• Highly Reflective: Bright white finish with a high reflectivity that helps lower interior temperatures and cooling costs.
• Versatile Application: Can be brushed, rolled, or sprayed onto EPDM, TPO, PVC, fiberglass, spray foam, and metal roofs when proper equipment is used.
• Large Coverage: One gallon averages about 60 sq ft, so the 5 gallon pail covers substantial area for RVs, trailers, or small commercial roofs.

Who It's For

This 5 gallon silicone roof sealant is ideal for RV and camper owners who want a long-lasting, single-day repair or preventive coating, and for small commercial or trailer roofs where UV resistance and ponding water performance are priorities. Contractors who need a reflective top coat that reduces interior heat will also appreciate the bright white finish and the product's flexibility across substrate types.

Those who should look elsewhere include DIYers who need a small sample for a tiny patch job, since the 5 gallon pail is designed for larger surfaces, and users without access to a high-pressure pump should plan to roll or brush rather than spray, as spraying requires a pump capable of at least 6,000 psi.

Pros & Cons

Pros

• Long-lasting performance that resists UV and ponding water, reducing the need for frequent recoats.
• One-coat application streamlines labor and lets many projects finish in a single day.
• High reflectivity lowers roof surface temperature, helping cut cooling costs.
• Easy to apply and self-leveling, producing a smooth, high-gloss finish customers describe as looking like a new roof.

Cons

• 5 gallon size may be excessive for very small repairs or single small patches.
• Spray application requires a high-pressure pump of roughly 6,000 psi or more, which not all users own.

Specifications

Brand	Marlin Coatings
Volume	5 gallon
Composition	100% silicone
Coverage	About 60 sq ft per gallon (self-leveling)
Recommended Roof Types	EPDM, TPO, PVC, Fiberglass, Spray foam, Metal
Reflectivity	Bright white, Solar Reflective Index 113
Application Methods	Brush, roll, or spray (spray requires 6,000 psi pump)

Our Verdict

The 5 gallon 100% Silicone Roof Sealant is a solid value for RV owners, trailer and small commercial roof projects that need a dependable, single-coat waterproof membrane. Its UV and ponding water resistance, plus a highly reflective white finish, make it an economical long-term option despite the larger container size and spray equipment needs for some users.

Frequently Asked Questions

Can this be used over existing rubber roofs?
Yes, it is suitable for EPDM and other common roof membranes when the surface is prepared correctly.

How much area will the 5 gallon pail cover?
Coverage averages about 60 sq ft per gallon, so the 5 gallon pail covers roughly 300 sq ft under typical application thicknesses.

Is a primer required before application?
Surface preparation is important; follow surface cleaning and repair guidance before applying, but the product is designed to form a waterproof membrane in one coat on compatible substrates.