Body filler problems

[jakelandry]

The pinholes are more than likely from you not cleaning it well enough before applying another layer. You can thin the glaze out more with resin, acetone, paint thinner, alcohol, etc. if its simply for filling holes. Also using a Da isnt the wrong way to do it, but you shouldnt use a da until you know how to do it by hand and understand how everything works.

 

[caseyrock]

Either you didn't clean the surface well or you are using cheap bondo. If you are sure that the surface is clean then leave the little tiny holes. Just sand it smooth and put a couple layers of primer on top and they will disappear. Sand in between each layer of bondo. You also might want to try block sanding. The DA may be heating up the bondo too much and if you aren't letting it harden enough it will bring the bubbles up.