After Junior welded up my tank there was still a bit of crud shaking around in there so to knock it around a bit I added 75 pennies and shook the living daylights out of it. It's a good idea to keep track of how many you put in and try to get that many out again at the end.
Next up was a good rinse with solvent and acetone, after which I needed to make sure it was good and dry.
Then the Red Kote went in. This stuff is new to me, but Junior swears by it and he's done a lot more bikes than I have and usually knows his stuff. In the past I've only used Por15s tank coating (that's what's in LoudBike) and have had no trouble with it, but this stuff's a bit thicker, and the 750 tank's a bit rougher. So I'm hoping this will take care of the couple of pin holes that are in the tank.