Well just like the topic says Dura tec rocks. It is a sprayable and paintable body filler/sandable primer that can be built up twice as thick as high build primer and is eurathane based so it has a little bit of flex and will not crack.
We get it from a place in Mississauga called Canada Composites, and have not found it anywhere else as of yet. Just wanted to share this tip with others.

 

quick question... does it have hardener in it..?

 

Bruno was telling about this stuff you guys use. He almost popped a valve he was so excited about it. Will be testing it out shortly I do believe. Good find........

 

You add the hardner to it. We make 1/2 liter batches at a time and the ratio is 10ml MEKP for 1/2 litre Dura Tec, or 2% hardner to total volume. That gives you about 15-20 min work time. If it starts to get a little chunky or thickens to much pour it out and clean the gun or you will be throwing the gun out.