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I have some pot metal parts I want to remove the paint from. I have a blast cabinet (currently full of Silica sand) and I have two (free) bags of soda for blasting. Any one have any idea what kind of results I might get from the soda vs sand? Or possible problems trying to put soda thru sand blast equipment? My concern is if I Sand blast them it will leave too rough of a finish. I'm hoping for a smooth finish mostly uniform in color.

I'd try it, You may want to look at eastwood's catalog, check the diffrences and go from there?

Jeff I have that vibratory tumbler you could use. The finish depends on how long you let it run and what media you use.

I was told these parts are too big for a home size tumbler, the theory being they need to "tumble" to get done. The ultimate gola is to have RS headlight doors (inners) that look like they did when new. I need to find some practice pieces before I try anything on the real parts. I'd rather have them painted black then rough.