Lippert Components 5160 Alphathane Non-Sag RV Sealant — White, Paintable, Weather-Resistant for Vertical Joints

Lippert Components 5160 ALPHATHANE is a high-strength, non-sag sealant engineered to create long-lasting, paintable seals around RV windows, doors and other vertical joints.

When you need a professional-grade solution for sealing dissimilar materials on a fifth wheel, travel trailer or motorhome, this Alphathane formula delivers strong adhesion to wood, metal, glass and common construction substrates. Designed for vertical surfaces, the non-sag consistency stays put during application, cures weather-resistant, and is available in four colors so seams blend with your RV’s finish. The formula is low-odor and free of solvents or isocyanates, making it suitable for both interior and exterior work.

How does 5160 ALPHATHANE handle vertical seams and tight joints?

Its non-sag rheology prevents run-off on vertical and overhead joints, so you get a neat, continuous bead without slumping. As it cures it forms a durable, flexible seal that accommodates movement between different materials.

• Non-sag formula for vertical and overhead use
• Strong initial tack reduces need for tooling
• Maintains adhesion while allowing flex with substrate movement
• Paintable after full cure for a finished look

Will this sealant stick to the variety of materials found on RVs?

Yes — the Alphathane compound bonds reliably to a broad range of surfaces commonly used on RVs, including metal trim, wood framing and glass. It’s formulated to create a durable interface even where materials differ in expansion rates.

• Proven adhesion to metal, wood, glass and most construction surfaces
• Useful for flashing, window and door perimeters, and general joint filling
• Works with other Alpha Systems products for integrated repairs

How does this sealant perform outdoors and around the RV?

Once fully cured, 5160 ALPHATHANE resists weathering and everyday exposure to sun and moisture. It’s formulated to hold up to the elements while remaining flexible so seals don’t become brittle over time.

• Weather-resistant finish for exterior applications
• Retains flexibility to prevent cracking from vibration or thermal expansion
• Low-odor, solvent- and isocyanate-free for safer indoor/outdoor use

What color and finish options are available and how do I choose?

The product comes in White, Beige, Gray and Almond so you can match common RV exteriors and interiors. Choose the color closest to your trim or paint to minimize visible seams; the sealant is paintable if a perfect color match is required.

• Four factory colors: White, Beige, Gray, Almond
• Paintable after complete cure for custom color matching
• Available in single tubes for targeted repairs or spare maintenance use

Who this is for: This sealant is aimed at RV owners, service technicians, and dealerships who need a trusted, professional-grade product for sealing vertical joints, window and door perimeters, flashing, and other dissimilar-material interfaces. It’s especially useful when you want a non-sag, paintable sealant that’s been engineered for RV use and made in the USA by Alpha Systems — a brand recognized in the industry for complementary tapes, adhesives and cleaners.