I had dark spots appear on the outside of my kayak after putting it away wet with the hatches closed. I was lazy and didn't check for water in the hatches, when putting it in the basement. I did get it dried out, and the dark spots went away. I promptly added a seal coat to the interior, as best I could. And now I always pop the hatches and dry the kayak out when I put it away.

: Darn, I did not do fill coats on the interior glass of my new boat, and now
: kinda wish I had. I have not looked at the epoxy test web site in a while.
: How many people fill the interior weave? How many people decided to start
: filling after having problems?