Painting fresh cast before or after machining?

Josh in Pa · Apr 3, 2012

I have some fresh cast peices that I need to eventually paint, but some machine work needs done also, which will involve cutting oil. I have never done this before, but am afraid if cutting oil gets all over the fresh cast, I will have difficulty getting it back out. I was thinking instead, wash them down with laquer thinner out of the gun, epoxy prime, and then do my machine work. Then at least oil couldn"t penetrate other areas. Any thoughts? How do they do it at the factory? Thanks
Josh

Josh in Pa · Apr 3, 2012

Maybe I'm on the wrong forum, I've since done some reading on the web, and the common theme is drill and tap cast iron with no lubricant. Maybe this is my answer.
Josh

CNKS · Apr 3, 2012

Either way, do the machine work first, the machinest will not be able to avoid damaging the paint. All the cast I have worked on is saturated with oil anyway from leaks.

David G · Apr 10, 2012

I would prime and seal them first.

Painting fresh cast before or after machining?

Josh in Pa

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Josh in Pa

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CNKS

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David G

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