Not really sure one way or the other. Until yesterday, I was unaware of R12a. I'll stick with R134a, for now. I'm just trying to nudge people to have respect for compressed gasses and ac systems. I think a lot of people are under the impression they can fix anything on a car so why should the ac be any different? Overcharging is no joke. It might not explode like a hand grenade, but shrapnel is shrapnel no matter its origin. Healthy respect, know you limitations and dont guess.
As always: A little knowledge can be a dangerous thing.