If you're going to do a gloss undercoat, another tip is to try to avoid just doing a zone of gloss, but instead, cover an entire surface with gloss. For example, if you're doing it on a tank panel, do the entire panel in gloss. Even if you spray over this with dull coat, it can interact with the finish underneath, creating an uneven look (looks like somebody painted glosscoat in an area the size of the decal). If you paint to the edges of the panel, then at least there are hard edges where the transition happens, so it's not as obvious.
Or you can just glosscoat the whole thing.
I've found that a really glossy coat isn't best, but a good clean satin finish. A really dull coat will lead to silvering, but a slightly satiny finish seems to give something for the decal to stick to.
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