If the thinner is dissolving, not melting the undercoat, that is a chemical reaction, albeit a slow one. The end result is a melding or mechanical bond, created by a chemical reaction.
Either way, use more thinner and under some circumstances a tad of retarder.
no a chemical reaction is one in which the final states of the original chemicals are not the same as they were originally, and cannot be returned to their original state,,
a mechanical bond is one where there is nothing except the "bite" of the new layer into the old,, as in soaking into pores or scratches,,
Lacquer is neither,, it does not form layers ( when properly applied),, every layer adds to the thickness, but it is in fact, when properly applied,, part of the original layer,, the only way you can peel a layer of color off is if you did not apply it correctly,, that being, you sprayed it to dry, or not enough thinner, or the WRONG thinner,,
now think back to all the times I preach about systems, and using the thinner designed for the product,, you will start to understand my continued repeating of this,, you HAVE to have enough thinner in the material as it lays on the preceding layer to melt in, burn in, flow together, however you want to say it,
bottom line,, if you peel the color off the substrate when you are using lacquer, its because you did not spray the layer that peeled properly