I make it without vacuum a lot. I finish it off in a pyrex pie plate sitting on a pot of simmering water and stir it a bunch until no bubbles are coming off any more. Wouldn't likely pass tests for public sale but I'm sure you'd inhale more and more toxic hydrocarbons during a 15 min walk in any city
Same thing with ISO, naphtha or any other solvent.
Us old hippies love the stuff!