I think it was discussed on the Starmaster group.
As I said there, and as Mark wisely seconded here, DO THIS OUTDOORS and AWAY from sources of ignition (BBQs, tiki torches, etc).
Reagent grade acetone will be scientific quality with very low contaminants, but regular hardware store grade should be just fine for our purposes.
Alcohol is also perfectly fine, though it may contain a significant amount of water - read the label and be ready to blot away residual water droplets. I use alcohol around the shop quite a bit.
--- In email@example.com, "mdhopt53" <harrymark7@...> wrote:
> I use the hardware variety. The shop where I worked got it by the 55 gallon drum. Reagent grade would be prohibitively expensive.
> The stuff is an extreme fire hazard which can be initiated by most ignition causes, so be careful, and use it sparingly where the fumes don't accumulate.