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Im a painter most of the time. I spend most of my days in a spray booth, so I think I can suggest some things.
blotching is from a clean surface. Give a light sanding(600 is a bit overkill, 320 to 400 is good enough) and use rubbing alcohol.
IF it bloched, it will take much more paint to cover it up, whatever chemical is causing the blotching(oil, grease, etc) will go right through and will blotch several layers.
next time, use a primer, and by primer I dont mean a lighter krylong paint. Using Tan to prime for OD is not enough. Primer is ment to neutralize oils and other chemicals that cause bloching and to etch(sp) the surface so the paint sticks better.
other then that, fallow dmans instructions
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