Trailer – Resurfacing Roof, Replacing Roof Vents, Elastomeric Roof Coating For Metal Roofs

First, I sprayed phosphoric acid on the surface of the roof, waited 30 minutes and then washed it off with water. I then applied the base coat. It took two coats to get good coverage. 
Koolseal elastomeric base/finish coat. I bought this from a trailer supply place for about a total of $120.

Base coat.

Replacing roof vents.

Finish coat.

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