I'm not familer with that product, but for the cage, I would suggest a primer and then PPG chassi black from their industrial line.
For clean metal I'm not sure you need a rust type paint like POR. The PPG paint above gives a very nice satin black that looks great IMO. It can be used with or without a hardner. The hardner adds just a slight bit more gloss to it and still looks very good. This paint and hardner is also very inexpensive compared to other products we have used.
We now use this exclusively for all our frames, most bumpers, cages, etc.
If interested, I can get the PPG PN's off the cans tonight. I have a PPG dealer just down the road and could pick some up and have my dad bring it down in the car (I hope to be on the bike) if you want.