Well, From what I've read at coker tire, you are supposed to use special "radial tubes" when using radials. I guess because the radials are lower profile or flex more. I don't really know why. Perhaps it has to do with high speeds people like to drive today. I don't ever go over 60mph. That's a mile-a-minute! When I was younger (way back in the 1990s), we used tubes in all our construction trucks, which ran radial tires. I also had tubes in my old landrover, where I ran radial snow tires. Of course back then, if your tires were older than 10 years, nobody told you that they'd explode either.
The simple reason I'm not going to use tubes, is to save money! I'm mounting my tires at home too, being the cheap guy I am. Now, if I can't get the beads to seat, this won't have been a good idea! Hahaha. Most of the tire shops around here suck, and won't mount tires on old wheels. I don't know if they are afraid to get their hands dirty, or don't feel they make enough money when you bring in loose tires and wheels. Here, it seems to be about a hunert bucks, for 4 tires being mounted, with no balance.
I'll give the plastidip stuff a try. After-all, liquid electrical tape keeps the electrons flowing to the right places!