Pressure wise, for backing I'm up to 40psi. I'm sure any acrylic thinner should do the job. Some people use water, but I stick to thinners using the 'milk-like' consistency as a bench mark.
Not sure about the 72hr rule Neal? I can only guess a chemical based thinner (as opposed to water) may alter the chemical make up of the paint, which then effectively voids what it says on the tin so-to-speak. Never had problems with storing thinned down solvent based stuff in the past, but not sure about acrylics. If it was all for personal use I'd experiment, but not if you're charging customers as one flakey shell could ruin a good reputation.
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