Rep Power: 262

I have a fiberglass front bumper on my car and I want to repair the pressure cracks in it and get it repainted. I know I need to sand down the cracks and reinforce behind them to stop the flexing, but do I use Gel coat over the area of repair after it has been sanded down to the fiberglass or just bondo over the sanded spot? Any tips will help Thanks

 
Rep Power: 225

gelcoat isnt needed, use a good filler (EVERCOAT/RAGE) then finish it with a glave putty(evercoat metal glaze, sand, prime, paint.

 
Rep Power: 262

Thanks for the info I will have to get on it soon.

 
Rep Power: 273

Depends how bad it is. The cracks I wanna fix (and the few I did fix already) needed fiberglass strands and the epoxy/hardener to reenforce from the inside. That'll probably take a full day with lots of patience.