Prime & Paint underside questions

I had the bottom of mine blasted. Etch primed it and then followed up with a coat gloss black urethane paint. I've only done up to underneath the rear seats at this time, as I have to pull the rear end and replace the spare tire well. Have to repair the front section of the passenger side floor pan yet too. Once I get all this patched up, I will etch prime the bare metal and put a couple more coats of polyurethane black on it. I'm not much of a painter, but I can say it came out pretty darn nice!