well Wayne, to me it looks like the cream did not have enough thinner, or was sprayed to dry,, or it was to warm or the thinner was to fast not allowing it to melt into the silver,, do I understand the silver is also brodaks?
my theory would be that when you sprayed the next color on the cream, it allowed the thinner to penetrate just enough to break the bond with the silver,,
silver, especially with a high metallic silver, does not lend itself well to adhesion as there is a higher concentrate of solids ( the metal particles) than with typical dope,,
therefore its harder to get a good melt into it,,
silver is a carryover from full scale aviation where the silver is used as a barrier for UV since Dope has no UV protection and the UV would penetrate the dope and deteriorate the fabric covering,, it does serve some purpose for a sanding finishing guide to help see imperfections but I dont use it, a bright white and a strong lite casting across the surface is just as effective to me,,