likely surface contamination
you've washed off and sanded thru it, if you've still doing fill coats, mix up a small batch of epoxy and put it on and see if you're happy with the results
better to sand off a small area instead of the whole boat
you've washed off and sanded thru it, if you've still doing fill coats, mix up a small batch of epoxy and put it on and see if you're happy with the results
better to sand off a small area instead of the whole boat