I had that happen on a sealer coat and I tried to just sand out one discolored area and put on some more epoxy as a test. It turned out to be a different shade than the surrounding wood. I finally bit the bullet and sanded the whole boat. A lot of sandpaper, a lot of dust, and a lot of work. It looked good after I was done and I've been much more careful since. Wetting out the wood before you epoxy should make those areas show up. Good luck and wear a mask!

: I just finished putting the first coat of epoxy on my hull. (this is my first
: stripper). In some areas I can see lighter color blotches on the dark red
: cedar strips, which I would guess is glue that didn't get sanded off.
: Should I wait 24 hrs. till the epoxy hardens and sand that area again ? Or
: just till the epoxy is cured enough to attack the spot with a cabinet
: scraper ? When I get around to sanding the deck should I be able to see
: these areas by wetting out prior to using epoxy ?