I had no issues with the nail polish remover I had on hand (I mainly used it since it saved me a trip to the store), but pure acetone would be the better option.
I'm guessing this is not an acrylic paint then as it has a solvent based thinner? Full precautions when you spray it? Respirator, no ignition sources, etc...
That is what I miss most about Polyscale, the safe paint that won't turn my pilot light into a rocketship engine.