Epoxy - Low spots/dimples

After sanding I still have some low spots. Would prefer to not sand to much of the fiberglass. If I put filler would that be a bad way to go because I cant sand there?

 

I sounds like you have the "bubble" problem. Epoxy will bubble like mad if you mix too much air into the resin while stirring it, or you leave it in direct sunlight, or if you put in too much hardener (part b), or for other reasons. You could put another layer of resin, mixed slowly and allowed to set inside a building or in the . But if you don't want to do that, certainly you can fill the holes with filler. I have done that, but the best thing is to simply avoid the bubbles.

 

Filler of course - as you cant guarantee a perfect thickness when applying epoxy. - unless you use Peel Ply, or thicker mylar, which enforces a uniform surface.

 

basic no bush marine epoxy is the only marine epoxy with bubble breakers in it - for situations like this. Its cold weather cure option good down to about freezing

 

Some images (pictures) of the areas affected and/or a better description of what you're experiencing is necessary, to properly ID what is happening. As mentioned above, epoxy and sheathing is more about technique and procedure, then the actual goo employed. Now that the deed is done, there are options for the fix, but which one requires a little more description.