Have you seen LikwidArt? It's a raised, slightly squishy, shiny gel. the different parts are curved, so I'm pretty sure it'll look crap if you clearcoat it. The clearcoat would collect in the grooves...
Mooks vinyl decals are just flat vinyl graphics a fraction of a milimeter tall, thus very easy to clearcoat over
Slugster makes raised domed stickers. a bit like LikwidArt, but it's a clear resin dome over a printed graphic, so it has depth and weatherproofed-ness while looking like (well, it actually is) a top quality professional raised decal
look at their individual corporate pages to see what their work looks like