quick working with bondo question, adhearing bondo to fiberglass Options

[celicarocker]

ok, im ordering a set of the z3 fenders, becuase mine are trashed and i need a cheap replacement... i dont like those vent things by the door. now ive never worked with this stuff, but i have had alot of experience with plaster on walls, and sanding that stuff down...

now is it basically the same thing? id glob the stuff on in the holes, wait for it to dry, then sand it smooth, right? like i said i do it to walls with spackle all the time, so it shouldnt be that hard... but is that basicially the steps?

[DmVinny]

You can use bondo, but fiberglass is alot stronger...

With the bondo though your gonna have a rough time filling the whole unless u put sheet metal or grate behind it... so it doesnt sink in.

But its basically glop some bondo on a piece of cardboard,etc. than add a bit of hardener stir, and apply...