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Antique Tractor Paint and Bodywork

Painting over top coat

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BillD1

05-27-2006 07:15:02




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The top coat is still solid but the wrong color. I plan to prime over the original finish. The question is should I use an etching primer or will the old standard high fill primer be good enough. The paint left on is several years old and any looe or questionable areas have been steam cleaned and wire brushed




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CNKS

05-27-2006 09:46:53




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 Re: Painting over top coat in reply to BillD1, 05-27-2006 07:15:02  
Etch primer is primarily for new steel that a body shop does not want to sand (time is money to them). If the old finish is sound, you can use the primer you are used to provided it will adhere to the bare spots you have created. It would be best to use an epoxy primer to adhere to the bare metal and SANDED old paint, then follow with a compatible surfacer and sand it for a smooth finish. I prefer to remove all the old paint because there is very likely rust underneath it. Use a good wax and grease remover before and after working on the old finish or metal to remove any contamination. Steam cleaning does not assure that the surface is absolutely clean, which you must have for the best adhesion. You will contaminate it with any mechanical process you decide to use. The above applies to sheet metal. For the cast your wire brushing will have to suffice, as it does not sand easily; just clean it good with soap and water, or a houshold cleaner such as 409, then remove all remaining residue with with repeated applications of wax and grease remover. The only primer you need on the cast is epoxy. No need to use a surfacer over that. If you insist on etch primer on the sheet metal, do not use it on the cast, as it may lift the topcoat.

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