I normally clean it up with a sharpened paint scraper(edges rounded of course to avoid gouging). The sanding will not work really well with green epoxy and if it does, the dust is quite toxic until the epoxy fully cures. Don't wotty about leaving white streaks as they will disappear under the new epoxy and glass.

Fred

: I did a precoat on the hull last night. The surface of the hull is pretty
: bumpy in some areas now, as you can see in the photo below. Should I go
: over the surface lightly with 120 grit to knock down the bumps a bit? Or
: maybe it doesn't matter too much once the glass is on top?

: thanks