I don't see what the VOC/flammability would have to do with marketability. I can buy pure acetone at any of the local big-box stores. I think the real reason is that the formula is out there, and there's no good way to patent it when everyone can buy the ingredients off the shelf for less than it could be profitably marketed for.

To a previous poster: the point of the "scientifically rusted bolts" is to remove a variable from the testing. Either the bolt/nut is going to come off, or something is going to break. ATF/acetone appears to be the formula that makes the first outcome the most probable. Sometimes nothing will work (when the rust is in effect a cold weld--the two threaded surfaces are no longer metallurgically distinguishable).

Jason