I have drips on insides of my Northeartern Dory that came from the epoxy mixed with Cello fill (when the lapstrakes were filled in from the outside), also some areas around the puzzle joints have excess epoxy - also with cell fill in it. both of these areas are cloudy. I can sand them down after the first one or two coats of epoxy have been applied generally, but thus far i have yet to get the white or cloudy parts to disappear (even after I wipe clean with denatured alcohol). 

Does this just mean more sanding more carefully around just those drips or will that cloudy surface be permanent? I am concerned about sanding down to the bare wood and going through the plywood's first layer. I want the affected areas to be bright so these cooudy areas are a concern.

Havent found a post on this issue yet.

Thanks in advance for any tips, i dont want to go too far and cause more problems than it already is, but I also dont want to stop short of fixing it and living with these visible drips forever.