Don Stauffer:
You run a serious risk of silvering. Much better to put down gloss, even if just in local area of decals. You can dullcoat them after application.
But...I just tried the "local gloss" thing for the first time on my Achilles...and after the flat coat, you can still tell where the gloss was applied. I figure the washes, streaking and pigments to come will obscure it well enough, but still, annoying. Next time I will be glossing the entire thing.