There's no need for more glass unless it's low. The process from here would be.
1. Sand with 36 until ~80% smooth.
2. Then switch to 80 grit until smooth and no resin over unscuffed areas.
3. Do a skim coat of bondo, sand with 80, finish with 150. Repeat the skim coats and sanding until satisfied, but don't use 80 anymore.
4. Sand the area with 220 and about 5 inches around. Then sand another 1/2 to 1 inch around that with some 500 for a blend.
5. Clean, mask, and spray. Then sand and buff.
Alternatively, you could just brush gel it, but it would be noticable.