Acrylics dry from the outside in. As opposed to enamels which stay tacky longer.
Also, adding coats over paint does nothing to improve adhesion. It's all about the initial paint-to-plastic.
In fact, as maybe OMG suggests, if you clear coat over paint and adjoining tape, the clear may well form a bridge that brings some paint up along with the tape.
I generally wait a day for coats to dry, although I do like to take the tape off earlier.