Topflite as a brand is all but dead....no more models, arfs, kits, monokote, trim strips, solvent....all gone---- only remaining stock at folks like Graves RC...etc....
bottle of Top Flite MonoKote Trim solvent sez: cyclohexanone dihydro 1(3H)-furanone and petroleum hydrocarbon
too lazy to seek the MDS ....but not Acetone, MEK, or Xylene....I seem to recall one forum claimed it was actually a Nitro Methane / or Ethane derivative but I am no chemist....perhaps raw nitro does work...dunno