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Metal prep from blast to epoxy best way.

#1
So im going to media blasting a couple vehicles under neath I said and out engine bays all. I’m going to clean and degrease before blasting using a media to obtain an 80 grit tooth. Then apply epoxy. The cleaning stages is where I can’t decide. I’ve seen everything to just blowoff and spray epoxy. To spray wax and grease remover on and just blow off which would just float contaminatesI would think. To wash with dawn and water. Which I like this idea but I don’t want to prime over any flash rust. To go back over your blasted panels with 80 on a da and then grease and wax remover like normal but that seems like a lot of extra work when the tooth is already there. And you’d have to get all the nooks and crannies? Thanks for any input it’s greatly appreciated
 
#3
So why not just clean with 700-1 and be done with it.
Works for me I did some more research a guy on here said to clean with 700 then go around with a red scotch rite and a blow gun and blow the lent off sounds like it will work great. As long I use my clean booth air or heck even an electric leaf blower might work.
 
#5
I used the 700-1. There is so much tooth from blasting that when you wipe off the degreaser, it leaves a lot of lint. Though the lint will get buried after a couple coats of epoxy. I wouldn't trust blowing off the degreaser, you have to lift the contaminants from the surface. If a puddle of contaminants get dried by a blower, in my mind, they're still there. Next time, I will try Shine's method of dawn and water.
 
#6
I used the 700-1. There is so much tooth from blasting that when you wipe off the degreaser, it leaves a lot of lint. Though the lint will get buried after a couple coats of epoxy. I wouldn't trust blowing off the degreaser, you have to lift the contaminants from the surface. If a puddle of contaminants get dried by a blower, in my mind, they're still there. Next time, I will try Shine's method of dawn and water.
You are correct. It takes only a few minutes to go over it with a DA and 80 grit. You will still have the great tooth for the primer but the metal will no longer grab your towel. It will also clean off any blasting residue.

John
 
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