Deve ~
If the old paint is in good shape as far as adhesion, I would recommend
just sanding it lightly to remove any gloss or imperfections. The old
saying was that the best primer is the old topcoat if it has good
adhesion and is smooth. Of course you must feather out all the dings
and scratches and use a good solvent to remove all the old wax and any
oil on the surface. If you sand through the topcoat and the primer down
to bare metal than treat that like you did any other bare metal parts
before repainting.
Technically an old paint job that has good adhesion to the primer/metal
surface and shows no corrosion under the paint film is just a "glossy
primer" and just needs to be sanded so that the new topcoat will have
good intercoat adhesion.
Tom
Tom Poterack
Moline, IL.
'49 Chevy Pickup Retro Rod
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