Peddinghaus decals are very fragile, both in applying and overcoating. They say in their literature that they print them on an ink jet printer so the ink is very susceptible to the chemicals in paints like Testors dull coat. I used them ( took two sheets to do one tank due to the fragility of the decals themselves ) for a Sherman. I will never use them again. Some praise them, but for me, the cost should guarantee a better product. Anyway, peddinghaus sugests you use an acrlic clearcoat. I used Model Masters ( with an airbrush ) with good results, then I oversprayed with Testors Dullcoat to seal evrything up. Previous to all this, I also overcoated the entire tank with clearcoat for the decals ( does a lot in eliminating silvering). I sprayed the whole tank so when you put on the dullcoat there will no be any shade variances with the colors ( some with clearcoat, other areas still flat).
Hope this helps.

Jim