Metal prep is different than the rust converter. After you apply rust converter you do not wash it off, it stays on.
I bought only one quart of the rust encaspulator, and have plenty left over. That stuff covers very well. I applied it with a foam brush, that made it real easy to get into all of the cracks.
Once that cured, I lightly scuffed the whole frame with 320 grit sandpaper, blew off the dust and I was off to the races with the Rustoleum.
Frame looks great, and it is easy to touch up scratched during reassembly.
