I would wipe some fiberglass filler over it as well. It's even dries dark green. After spending an hour with a soldering iron and a heat gun trying to fill just screw holes in the top of my tub, I realized that fiberglass was going to be much, much faster and more reliable than the plastic welding. I ground a dip into both sides of the holes or cracks first. This makes the filler shaped like a yo-yo, can be sanded flat on both sides, and won't pop out. Win.

This is what I used: