A fresh coat of acrylic paint will be solluble by isorpopyl alcohol for many days after application, perhaps forever.
Instead of the hairspray chipping technique, which involves a lot of B.S., why not apply a base coat, followed by acrylic top coat, and then use painbrush dipped in alcohol to chip away at the acrylic top coat, exposing the base coat?
The base coat can be proofed against alcohol by using oils, lacquers or even Future floor sealant.
I Fully agree with you on this. I always take models, when I am getting serious and use a clearcoat of Lacquer. That way chipping Acrylic Or Craft Enamels(Acrylic or Not!) with a Stipple brush is easy!
My main wonder on this is that since some acrylics, such as Vallejo, turn into a gummy mess with rubbing alcohol, this may backfire and turn into an even worse mess. The basic concept is sound with Tamiya and Gunze acrylics, but experiments are likely in order.