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A roof coating is only as good as the surface it's applied to, and fiberglass roofs collect a mix of wax, oils, and road grit over time that keeps new coatings from bonding properly. Dicor's Clean & Prep is formulated to strip that buildup off before you lay down a fiberglass roof coating system.
It comes in a 1-gallon size, is biodegradable, and is designed specifically for fiberglass RV roofing rather than rubber or metal roofs.
Run this before your roof coating application so the new coat has a clean surface to grip.