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Antique Tractor Paint and Bodywork

painting inside castings

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Eurlith

11-24-2005 09:43:47




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I'm getting ready to solvent clean the castings and get them ready for sandblasting. I notice that the inside of the castings have been painted allready, I assume at the factory. The inside of the castings look great, I'm sure to the oiley enviroment that they've lived in. My question is that if the inside is in good shape is it still necessary to sandblast the inside of the castings; or just tape-up the holes and sandblast the outside to prep for painting. Also, what is the minimum set-up I could get away with in terms of sandblasting. I was thinking one of the pressurized blasters I see at Harbor Freight and maybe a 135 psi 60 gallon upright I saw at Sears. Comments? I have much time for this project if that helps. Thanks.

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Rod (NH)

11-25-2005 12:14:45




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 Re: painting inside castings in reply to Eurlith, 11-24-2005 09:43:47  
Hi Eurlith,

What you see on the inside of castings is probably Glyptal. It is (was) used by OEMs and high performance enthusiasts on the inside of gear boxes and automotive engine blocks and other castings. If it is in decent shape, I wouldn't disturb it. I don't see a reason to. I'd just tape up the holes and blast the outside. Afterwards, make sure you clean out the inside (some grit is likely to get inside anyway) before reassembly. A pressure blaster is much better than a suction blaster and the more air cfm, the better for blasting. It is very easy to become disappointed with a suction blaster or with an air capacity of less than about 15 cfm unless the parts are relatively small. It's the compressor's capacity in cfm that makes the difference in keeping up with the nozzle, more so than storage capacity.

third party image Rod

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