Re: Sandblasting?

Posted by CNKS on February 26, 2005 at 14:19:28 from (204.249.178.138):

In Reply to: Re: Sandblasting? posted by Marlin M '51 on February 26, 2005 at 13:49:18:

Etching can be done by sanding, or you can use a phosphoric acid treatment -- cast is hard to sand, so I wire brush it. Wire brushes may leave too smooth a surface, but I have had no problems, yet. Nothing wrong with applying primer to old coatings, but the problem is most tractors have already been painted at least once, Usually a hurry up job, and the old finish is probably not near as good as it is on a car or truck. You don't know what the previous owner did. But, if you think it is ok you can sand it and seal it with epoxy primer before topcoating. I always go the bare metal route, for the above reasons. Most modern topcoats are not sanded between coats, unless you are talking about color sanding a rough new finish (where you messed up) and either recoating or buffing it out. Surfacers are sanded between coats to provide a smooth finish, and to cover scratches that occurred when going to bare metal. 320 to 400 grit is usually used on surfacer, 1000 to 2000 grit when color sanding new topcoats. If you are using epoxy primer on bare sheet metal, the bare metal is usually sanded with 180 grit to assure adhesion of the epoxy, then the the epoxy is coated with surfacer and sanded with 400 grit as above.

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