RxP has a MSDS flash point of 140F, pretty much the same as industrial solvent while acetone has a flash point of -4F.
Is the other 10% water? That's pretty inert and would raise the flash point from that of pure acetone (but so would many other additives).
Acetone is a very good solvent for rubber and plastic. I would be hesitant to put it in my car, but such a small amount might be OK.