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LOL they're 4 1/2" Scotchbrite wheels on my grinder, I tried to find those 7" purple 3M Strip-it discs but no luck. I need to take a break between sandblasting, I don't want to kill my new...

Here they are, you can see it just looks like the metal is burnt with a torch but is smooth to the touch. The top left of the second picture shows best what I mean.

Sean

Thanks Pat, I'll go snap a picture just so you can see.

Sean

Thanks again Pat,
so if the sandblaster doesn't want to take it off (I'm using a cheap siphon feed but it's doing pretty well) then I should just scuff it up not try to sand it right out? Then...

I noticed while trying to get the rust off my car their is a thin coating of black stuff, is this the zinc oxide? Do I have to get that off before I start filling and primeing with the etcher? I...