08-12-2011, 09:36 AM
As Phil says, p40 fiberglass filler (don't go mad with it though as your arm will drop off if you have to sand that stuff back! It's hard as hell) and then a skim of p38 or similar to get a finished surface
Just make sure that you score the crap out of it so the filler has something to grip!
Just make sure that you score the crap out of it so the filler has something to grip!