I never could get my 40's balanced at a tire store correctly and tried just about every type of balancing media; Dynabeads, lead shot, metal BB's, Airsoft BB's, etc, in a whole variety of different weights, none of which worked 100%. One of the suggestions I was given was to add a small amount of antifreeze to the Airsoft BB's I was running. As I'd heard of people doing this before I thought I'd give it a try.
I did the two front wheels, could not tell any difference whatsoever, so never bothered with the others, fortunately.
On the weekend I pulled my tires off the rims, breaking a 40 bead was no easy task, but 10-15 minutes saw the job done with the use of a Hi-Lift. That was until I came to the first wheel that had antifreeze in it. As it turns out dried up antifreeze is the mother of all super glue.
Any liquid had long since gone and what was left was a hard as nails residue all over the inside of the rim. This seemed to be made up of a tan dust hardened like rock in a mottled pattern. Not sure where the dust came from, as every tire had some in it, but the two with antifreeze had a significant amount more. Most probably from wear/breakdown of the BB's.
This super glue put a stop to any thoughts of easily popping the bead off as it simply would not move over the residue at all. No amount of lubrication would help and a 15 minute job turned into a three hour job, although I did manage to get the second one that had antifreeze in it off in a relatively speedy two hours.
I had to sand the residue off as it was on their solid. So unless you are looking for a cheap alternative to bead locks, I would suggest not using antifreeze to balance tires.