James,
The decals you got were probably a pressure sensitive (or dry transfer) decal. Almost any decal can have clear applied over it for protection. A genuine varnish fix decal uses varnish as adhesive. What one chooses to put over the top is almost never varnish, but clear polyurethane enamel or similar material. I detailed the entire varnish fix decal application sequence a few months ago on the list. I'm not going to do it again but it should be in the archives.
Brian Baylis