I must be doing somthing wrong here on my truck. Im re-building my truck and im working in the body now, but it seems to take forever. Im flattening out some panels with bondo, and I'll sand the bondo smooth but the the panel wont be flat. Or i'll get the panel flat, but not smooth. Metal humps always seem to pop through making the surface wavy, so i'll hammer them down, but then other ones pop up. It seems Im just going in circles. Is body work suposed to be like this? Cause Im going to just spray my truck with house paint soon...... or light it on fire, or push it off a cliff. I dont have the money for a pro to do it, and I already have the tools and shop so what am I doing wrong here?

 

How thick is the body filler you're putting on?

Body filler shrinks, so if you put it on too thick, it's going to leave a wavy surface. Hopefully you're sanding it while it's almost dry, and not completely dry...

 

get some 3m guide coat and a long sanding block. the guide coat is a dry powder that you rub on the filer when dry then sand it off. when all the guide coat is gone your perfectly smooth. if there is a spot with guide coat in that is left and all rest is gone its a low spot that needs more mud. great stuff.. how are you sanding now? power sander 4' block hand ect...

 

Bodywork and prep always takes longer then you think. You are best straightening the metal as much as you can before putting on your plastic filler. Beginners usually take off too much. Sand with a long board for a large area and guide coat like others said. Also if the metal is stretched or oil canned at all, this can cause a lot of problems, and it must be shrinked by heating small cherry red spots with a torch and quenching quickly with a rag.

 

Im using a 4 inch and a 12 inch (I think...) block sander. That 3M guide coat sounds like it'll help. I guess I just need more practice. Thanks guys.