I've used the white (sandable) Krylon primer with mixed results. Seems to require a little extra sanding after it's applied.
I have a can of gray Krylon, but have yet to use it. I found a cheap supplier for Tamiya primer ($4.50 ea) and bought 3 cans of it. I'll try the Krylon gray out on my next project, maybe for the chassis/interior, but I think I'll stick with Tamiya for the body.
-Rick
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