I had put an Alclad aluminum finish on a 1:32 scale F-80. I had put it on fairly thick to represent a more weathered finish. I was a little worried about decals silvering over the resulting semi-matt finish. I had always had good luck with shinier Alclad finishes.
I decided to just try some of the smaller sencil decals first. They looked good immediately after they went on and dried. In fact, they still looked fine four days later! But, they were pretty glossy. Thus, you could see the decal carrier on all the stencils.
I decided I would try a coat of airbrushed dullclad. I tried a small area and it looked fine. So I did the areas around all the decals. After about a full day or two, the decals developed a frosty appearance behind the carrier film. National insignias still look fine, but stencils and the big USAF decals on the wing look bad. I wish now I would have left them glossy :-(