I used about the whole quart to do the frame gas tank straps, tank skid plate, axels, shackles and some other random items. I covered the axels and other spots that I thought might see some sun with black gloss krylon when it was still just a little tacky and it came out sweet.
Used a small foam roller and a whole bag of foam brushes. The roller worked great, but I'd use a few regular brushs instead of the foam. They totally fell apart and were a big mess.
Just make sure it gets fairly dry between coats. Not totally dry but not real tacky either. I put my second coat on too early and got some solvent pop.
I would get some of their thinner too. Works great for getting it off of you, and you can use it to thin out the Por a little as you get to the last of it. After a while the stuff in the tray I used and in the can started to thicken up before I could get the whole thing finished even though I was putting the lid back on the can after I pored into the tray. It takes a while to get every knook and cranny on the frame...