Some of your older model decals actually state,"Do not use Solvent". Why, I do not know. I followed their advise and then after using Solvaset on some others, that did not state that, with great results. I went back and like an idiot applied it to some older decals already on a model that were fine before and the Solvaset wrinkled them. Moral of the story...leave well enough alone. But I have had no problem with Solvaset on decals that says its ok to use a decal set.