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Antique Tractor Paint and Bodywork

Painting Sand Blasted Cast

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Ray A

02-19-2004 19:42:27




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Had the rims and wheels of my tractor cleaned (paint removed)by blasting. Do I need to do anything more before having them painted? Would like to have them painted with Dupont Acrylic Enamel. Thanks, Ray




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CNKS

02-20-2004 18:23:06




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 Re: Painting Sand Blasted Cast in reply to Ray A, 02-19-2004 19:42:27  
Do them the same you would do any other prepared metal, use epoxy primer before topcoating. Other than that, I don't consider sandblasted metal to be clean -- I wire brush (gets rid of some of the sand-blasting pits and gives a smoother surface) and actually wash with soap and water, dry with rags to prevent flash rust and immediately coat with Picklex 20, a phosphoric acid-zinc combination to get rid of any escaped flash rust and prevent rust until painting. Although probably not necessary, the Picklex also etches the metal.

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Joe Evans

02-19-2004 20:59:42




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 Re: Painting Sand Blasted Cast in reply to Ray A, 02-19-2004 19:42:27  
Yes, you do. Sandblasted metal will begin to rust in a flash unless you do the work in a desert. Prep the sandblasted surface with a metal wash that contains phosphoric acid. This product is available at any reputable painting supply shop. The phosphoric acid will dissolve the microscopic remaining sand particles, and will neutralize any remnants of rust. The wash will also prolong the onset of flash rusting for a short while.

The first coat of primer should be one that is called ‘self-etching’. This primer also contains phosphoric acid and will further the work that the metal wash started. The self-etching primer also provides sealing and will stop the flash-rusting . Don’t use standard primer-surfacer over sandblasted metal. Regular primer does not seal; in fact it is very porous and acts almost like a sponge where water is concerned. It’s quite alright to use standard primer over previously paint surfaces.

It is recommended that the self-etching primer be cover-coated within the first 24 hours after it is applied. Any longer than that will require the etching primer to be sanded to allow for a good bonding surface for the cover coat. Also, if you don’t cover the etching primer within this time and have to sand, you risk scouring through the etching primer exposing bare metal. And it’s very easy to blow through this primer as it normally only builds to a 4 mil thickness. Just get the cover coat on quickly and save yourself some headaches.

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Cliff Neubauer

02-20-2004 07:27:23




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 Re: Re: Painting Sand Blasted Cast in reply to Joe Evans, 02-19-2004 20:59:42  
Be careful using the self etching primer over sandblasted metal. I know PPG does not recremend it because the pits in the metal from the sandblasting can hold the etching primer making it too thick which can cause problems with later coats. If you are using a metal wash right after sand blasting an epoxy primer would be my choice before painting.



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