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Correct procedure for painting parts after they have been sand blasted?
Previously when I have cleaned parts by sand blasting and then used a metal conditioner, I find the parts have a tendency to rust. What can I do?
posted: September 12, 2008
  Answers (4)
When you sand blast steel or iron parts you are cleaning them down to the bare metal, with no protection against rust. A metal conditioner is a degreasing and de-dusting agent designed to remove traces of grease, dirt or moisture, but does not protect against it.

Try to give the parts a coat of primer immediately after sand blasting, either with or without using a metal conditioner. Or you could try using an air blower to remove dust left by the sand blasting instead of using the conditioner. But it is still necessary to get that primer on immediately while the metal is bare and dry. My preference is an oil base primer for maximum protection - it takes longer to dry in between coats, but gives better protection than the quick dry primer.

Good luck!
posted:  September 12, 2008
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I always primer my parts after sand blasting them. I have a small cabinet so I usually only sand blast smaller parts and rattle can some primer on them after blowing them off good with air. Have never had a problem with rust and many of them are still sitting on my bench after a good amount of years!
posted:  September 12, 2008
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Well i would suggest useing prepsol after the blaster then dupont sells a high build rattle can PRIMER if you dont have a gun. with this style primer is a self etching which means it set quick so use thin layers not to get runs . i would say 2 to 3 coats should do .
posted:  September 19, 2008
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As mentioned, a metal conditioner only cleans. We use a self etching primer or an epoxy primer over bare metal. The self etching is available in a rattle can from Martin Senour at any NAPA store #7220 or Duplicolor has one as well. After the self etch or epoxy you can paint over them with proper flash time from the undercoat. If you need some primer build to fill in pits or scratches, then you will need to apply a high build primer, sand, and repeat until they are filled. Hope this helps.
posted:  September 29, 2008
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