I bought a gallon of this newfangled rust encapsulator / primer coat stuff and it can be mixed with 20% water for spraying in a gun.. I think I'm going to spend the $16 and buy one of those Harbor Freight guns with my cheap little Harbor Freight compressor and see if I can't do my floorboards..
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That's a pretty good video link on Amazon.. it's pretty good reviews as well. I've got a pint of por15 coming but I think I'm going to go with this.. it says the gallon will cover a thousand square feet which should be enough to do my next three projects LOL but of course a pint probably just fall a tick short.. (I know my luck LOL...)