Good info!
Unfortunately, we never suggested using straight Methanol, so the flamability aspect is a very important one.
Also, if Acetone eats away a little bit at vynil, then it will eat away at it over a period of time.
I seem to remember something about acetone, where if the recycling logo (the little arrows in a triangle) have a number 2 or lower, then it is safe with Acetone, or something like that. It might be #1 only, my memory is bad!
Check it out