whats a good filler that will bond to ABS

it doesnt need alot of filler on it just to match the contour. i was thinking of using a straight edge on it to follow the countour when im laying it down.

on a side note anyone got any ideas to mount this thing back up after its done? I lost 4 screw holes that held in the cupholder and ashtray when i cut this stuff out so i need to figure out how to compensate for those mounts.

Fiberglass the whole piece it will make it super strong and you could make new mounts on the back of it!

fiberglass(unless mixed with epoxy resin) wont bond to abs the poly resin sucks with that. as of now its very strong and rigid but the mounts are aht i need to figure out.