What Does Semi Self-Leveling Mean for RV Roof Sealant?

Updated 10/22/2026 | Published 10/21/2026

Question:

What does semi-self leveling mean? can i use this on the roof?

asked by: Mark

Expert Reply:

Hi there Mark!

Semi self-leveling Sealant part # SI94VR means the sealant is fluid enough to spread out and smooth itself over a seam or gap, but thick enough to help keep it from running or sagging too much. Think of it as a happy medium between a really runny liquid and a thick caulk that stays exactly where you put it.

The Sikaflex 504 SL Semi Self-Leveling RV Roof Sealant is designed for sealing RV roofing components, so you can use it on the roof as long as your roofing material is compatible. I like that it works with a variety of roof materials, including fiberglass, metal, rubber, and TPO, and offers good resistance to weathering.

What type of roof do you have on your RV, and what are you looking to seal?

expert reply by: Heather A