Pitting filler?

[dprat1]

Hi,
In process of restoring Cavalier C-51-G. What is best to use for surface pitting? I'm sand blasting and filling with bondo and also filler primer. Bottom part of cabinet has lots of surface pitting area. Is there something between bondo and primer filler to fill with and allow more working time? Bondo sets too fast to work large shallow areas. Also, looking for "ammo belt" '>
Thanks,
Doug

[Jim]

Ask about Glazing Putty at your local automotive paint supplier to see what types they carry. Generally, this is utilized to fill sanding scratches up to #80 - #60 grit. It's not meant to be used like bondo though.
It usually comes in a large toothpaste style container and spread with flexible plastic or rubber spreader.

[sodaworks]

Keep in mind if you use alot of glazing putting to fill in large area's it will shrink.

[firemun]

Doug,
Dupont (and I asssume others do also) makes a sprayable fast build filler.  It is another product in the line between Bondo and Primer, more toward the primer side.  It is not a putty like glazing putty and fills much faster than primer.  If the pitting is severe, it is probably not the answer.  For scale type rust it would work good.  

Most of the NASCAR teams here shoot this stuff over the Bondo and then DA or Block sand it off for a smooth finish.  When you see the grey and tan colors on the cars testing, this is usually what you are seeing.

There are also some sprayable polyesters out there that fill quickly... but they dry awfully hard and are a pain to sand off.
Just another couple of options.

jeff

[sodaworks]

I use poly primer after doing the body work on all my projects. I spray on 3 heavy coats and block sand with 400 wet. It fills in most blemishes.