Hey it's Ryan.
How to you work with body filler? Everytime I use it i get pim holes and it is really annoying. Thanks

Ryan The most common reasons for getting pinholes are first not stirring the bondo in the can before mixing it with hardener. You want to try and work some of the air out first. Then when you mix the hardener into the bondo, mix it on an old piece of plexiglass or metal. Avoid mixing on cardboard as the cardboard will absorb the oils from the bondo. Next blow off the repair area with clean dry air before applying the bondo. After you sand it and find pinholes, blow these spots out again with air and add another tight skin of bondo. Better brands of filler will leave less pinholes but you'll always have some. If they aren't too big or deep and you like the way the repair is and would consider it done except for the pinholes, skin the entire repair with polyesther putty, sand that and then cover with a 2K high build sandable primer that will fill in any small scratches and pinholes.

Hey it's Ryan again,
I was working my El Camino today and I still feel like I am missing out on something. I sprayed primer on a rough spot yesterday, one layer gray and one layer black. I went back today to sand it a little bit so I can find the low spots. I started out with 600 grit and that did ok, but it found only high spots. So to make it go faster I got some 320 grit to get rid of the highs, which was some bondo that I got on top of the original paint and I primer ran a little. I got all the highs out so I kept going with the 120 most of the black primer came off except in the low spots which is normal, right? Then I went farther to bare metal. Then I thought the maybe the original paint is messing me up because I put the bondo over the hole area of bare metal which is like 12"x12". When I would sand i would go to the metal and then paint was so high. Maybe what would help is a list of steps on how to fix a 1'x1' area that needs bondo and primer.
Sry for any confusing. I think i'm thinking one thing and telling another

It's easier to take away bondo than put it back.

Try using a filler file (sell them at parts stores) or get a 2x4 and wrap it in sandpaper. It will keep you from pushing too hard and making low spots.