I only use Walthers Solvaset.
Here's some details from the one and only about its use and effects.
Courtesy of BPMODELS
......also known as Bill Plunkt.
"Initially the Solvaset will cause the decal to
wrinkle up slightly, don't panic! This is normal and is part of the
softening process that gets the decal to conform to the underlying
surface. It takes about 1 hour for the Solvaset to dry thoroughly and
during that process I will check the edges and reapply Solvaset where
needed. Once dry, a 2nd coat of Future is sprayed through the air brush
and allowed to dry. The result is a seamless decal that's perfectly
blended into the underlying Future coat and sealed with the 2nd coat to
protect it from the weathering process".
See it all at Bills Website.