I used a powder coat called Silver Vein.
[EDIT: I baked it at about 400F for half an hour then sandblasted the surface. The coating needs something to stick to. Then I blew it all off and wiped it down with a surface prep solution before powder coating. Then it got baked again and left to cool.]
After scrubbing, it came out looking like pitted iron. I have another one that will show copper instead of silver. I may have been happier with that when building the final cabinet - being wood and all -, but this is a first run anyway. I'm having fun.
For the transformers, I sanded then brushed off the black paint to base iron, cleaned and varnished in a high-temperature clear coat. I used the same stuff on the quad-cap and copper cap after I polished those up.
(I must have wiped my finger across that copper cap while photographing.)
Last edited by Dallas on Thu May 28, 2015 11:17 am; edited 1 time in total (Reason for editing : More detail added - powder coating is easy if you've got an oven, sand blaster, spray guns, racks, barrels of coating... Yeah, cheaper to go to a body shop.)