Por15 recommends that you top coat the product with something, because UV's, I believe, will break the coating down. I used it on my floors, in my window jambs, down inside lower cowl corners, top of cowl, and my trunk pan. Took about two quarts. The stuff doesn't adhere well to slick metal. It wants a rusty, or at least sandblasted finish to adhere well to. As said above, cleanliness is key, but who paints over a non-clean surface anyway? I brushed every bit of mine on. No sprayer for me. I also have some on my shop floor, and it's there to stay.
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