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Alcohol is the "passive" component. Its function is to dilute the acetone. I use Ethyl alcohol 97%. Isopropyl alcohol can be equally used. Either type must have minimum water content. Water is not sufficiently volatile and warps the paper.
Pure acetone dissolves the toner immediately.
For large boards, I place the print/board between two wood blocks and press with a G-clamp. A few layers of kitchen paper over the print will distribute the pressure evenly.