Recommended for use in Airstream travel trailer wheel wells and underbelly.
Sikaflex-221 is a one-component, moisture curing polyurethane designed for use as an all purpose sealant. It cures to a permanently elastic seal, is paintable and stainable, and bonds to aluminum, steel, fiberglass and wood with proper surface preparation. Comes in 10.3 oz. tubes of black.
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