That is some cheap paint, any idea on how it covers. I'd use an epoxy sealer as a first coat, before you apply your blocking primer. The best epoxy primer for the money is Southern Polyurethanes, same goes for their high build primers and clears, and they have 7 day tech support.
I'd recommend a good water trap or a dessicant snake hose for a one time paint job.
Use some high quality tack cloths, you'll need about a dozen. Also sandpaper can add about $80-$100 to your project, depends on how many times you block it, if you have to sand it before clearing to get rid of any junk in it, and then sand the clear before you buff it.