Quote:
Originally Posted by madcow75
Let me ask this question aren't you supposed to prime the bare metal first before you fill?
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Filler is made to be put over bare metal or properly prepped primer, as long as it isn't etching primer.
As far as filling the pits, just using regular high build is kinda sketchy if they're deep. Primer shrinks as it cures and will sink down into the pits. Slick Sand is a polyester primer and has very little shrinkage compared to normal high build primer. Or just using body filler will work fine, since it's made to build up thick (within reason) and no deeper than rust pits are you won't have a problem of the filler being too thick to be stable. I'd rather use a product that was meant for building up a certain thickness (filler or Slick Sand) than a product meant as a surfacer (high build primer). There's nothing wrong with body filler when it's used properly and you keep it reasonably thin. I'd much rather have a 1/16" thick layer of filler to cover an imperfection than to use multiple coats of high build to achieved the same thickness- the filler will be far more stable.
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