Finishing a Pedal With Clear Nail Polish?

[m-theory]

epoxy should work with anything, you are essentially just pouring liquid plastic over the paint so it doesn't really react negatively to any paint. PITA to mix though.

Correct on both counts, although the mixing isn't nearly as much a PITA as sanding and buffing the 10-12 coats of spray bomb lacquer clear it takes to get anywhere NEAR the level of gloss that 2 steady minutes of stirring that epoxy can get you. 

Which type/brand of readily available sprayable primer would you recommend?

Ironically, as much as I frigging HATE the dry times and the product line in general, I have to say that I've had really good luck with the rustoleum primer.  It sands VERY smooth...glass-like.  I like that.  The lacquer products tend to dry and sand sorta "cakey" or "chaulky,"  but this aklyd rustoleum crap makes a much more convincing substrate to my eyes. 

Aside from that "gut feeling" I have about it, I've been using a skanky old box to road test for a bit over a year now.  It's in nothing but rustoleum primer, and, after over a year of being literally tossed, banged, and kicked around, there's not so much as a scratch to bare metal on the box, let alone any hint of peeling.  That's pretty impressive, considering it's sprayed directly over bare aluminum.  The adhesion is outstanding. 

[bamera]

+1 for very long cure times.

As far as primer goes, I use Super Galvite on my zink enclosures. The complete, rock hard cure takes about a month, although I´ve never waited that long.
It took me many ruined paint jobs to be patient between steps.

[Captainobvious99]

epoxy should work with anything, you are essentially just pouring liquid plastic over the paint so it doesn't really react negatively to any paint. PITA to mix though.

Correct on both counts, although the mixing isn't nearly as much a PITA as sanding and buffing the 10-12 coats of spray bomb lacquer clear it takes to get anywhere NEAR the level of gloss that 2 steady minutes of stirring that epoxy can get you. 

Which type/brand of readily available sprayable primer would you recommend?

Ironically, as much as I frigging HATE the dry times and the product line in general, I have to say that I've had really good luck with the rustoleum primer.  It sands VERY smooth...glass-like.  I like that.  The lacquer products tend to dry and sand sorta "cakey" or "chaulky,"  but this aklyd rustoleum crap makes a much more convincing substrate to my eyes. 

Aside from that "gut feeling" I have about it, I've been using a skanky old box to road test for a bit over a year now.  It's in nothing but rustoleum primer, and, after over a year of being literally tossed, banged, and kicked around, there's not so much as a scratch to bare metal on the box, let alone any hint of peeling.  That's pretty impressive, considering it's sprayed directly over bare aluminum.  The adhesion is outstanding. 

Thanks for your response. Sounds good to me. I'm in favor of the 'quick' process even if it does require a bit of extra work and care. I've done some mixing of fiberglass resins for other projects so I dont think this will be to difficult. Props to you for sharing your technique. I like the idea of using the upside down cups to support the boxes during the pour/coating process. I can also just use a nice large cardboard box to set over the curing enclosures with the top cut out and some clear plastic wrap stretched and taped as a viewing window.

I think I'll pick up some supplies and get the enclosures primered up and ready for hand painting...