Does Micro sol and Micro set loose it’s potency in time?
Not that I’ve noticed. I buy them by the box so some of my bottles have been several years old by the time I’ve opened them. They work best with Microscale’s decals and other “thin-film” decals. If you’re working with thicker decals and decals printed with computer printer ink (especially Alps), they may not be as effective, some Walthers Solvaset may be better in that situation.