I picked them up yesterday to give them a shot. As I expected, they are pretty much a varnish with paint mixed in, but they have great coverage and they are a quick/convenient way to do...well pretty much
what you'd use any clear paint for. It dries into an enamel finish, which is great as long as you dont plan on varnishing.
They are also way too thick to avoid brush strokes. I ended up thinning them slightly with water and then they go on great. Kind of defeats the 'gel' purpose, but on large flat surfaces I couldnt get an unmodified
layer to look good.
On these two examples it was used as the red of the armor. The first is on top of a black/grey gradient, the second on copper.
TLDR: They are convenient but nothing special. Will use again for certain things when time is a factor.