I'm starting my third year with Durabak applied to the upper deck/roof area. So far there as been no color change with the white. I'm very happy with it. Here is a recent photo I took of my dish but you can see the Durabak and the fiberglass come together. When properly applied I think for a old boat it's more practical. Hairline cracks and small blemishes are gone and touch up is very easy. Clean lines when masking is a must and plan on using 2-4 coats.