I've used Solvaset for over twenty years on more decals than I could possibly count.
Decaling on Enamels, its bombproof. I wet the area to be decalled with warm water, slide the decal on, then on a gloss surface apply just enough solvent to dampen the decal, plus a bit round the edge which will creep under. 90% of the time it will suck the decal down over just about anything - I have decaled model railroad locos with stripes over cast-on grab handle detail, and that's a BIG bump! If there is a bit of 'silvering', just prick the silvered area with a needle and slop on a bit more solvent.
On a matt surface really flood the solvent on, maybe some more tomorrow morning, maybe some more after that - the decal will settle right down eventually. Yep, I know, you shouldn't decal over matt, but you can get away with it sometimes. Just make sure the paint is absolutely odor-free dry first or the solvent may leave a 'tidemark'.
The only hassle I've ever had with Solvaset was with Hasegawa decals over Gunze acrylic paint, where the decal crazed, broke up and was rendered completely useless. Could have been the decals or the paint, I hardly ever use acrylics, and it was my first last and only plane
. I use gunze Mr Mark Soft on Acrylics just to be safe.
Cheers, Andy