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Old 02-19-2021, 02:00 AM
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lockedlex lockedlex is offline
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lockedlex lockedlex is offline
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Join Date: Oct 2009
Posts: 248
lockedlex will become famous soon enough
Sandblasting Opinions Requested

I have a painted valve cover from another car that I'm going to media blast myself. If anyone has any experience, would love some input:

1) The Valve Cover is Magnesium
2) My plan is to use Soda (medium grade) for the cover inside and outside. If that doesn't work, I'm going to use medium Glass bead for the outside and might leave the inside as is.
3) If I can't get rid of the paint on the outside with Soda, I will switch to Glass Bead, with Aluminum Oxide as a final last resort.
4) I intend to use Zinc Chromate primer with a flat black wrinkle coat spray paint in the end for the outside. I don't plan to paint the inside.

There are NO oil baffles on the valve covers, it's just a single piece.

My one concern is using glass beads on the inside and possibly having some "embedded" that might work itself loose later one (since Mg is so soft?). As I understand, Soda pretty much disintegrates/washes off.

Can I blast the edges that the gaskets sit inside or would that risk creating leaks? Those gasket seats are also painted the the paint is bubbling in various places in various degrees already.

Does this sound about right or would you have other experienced suggestions?

Thanks!
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