Check out this site:
It will tell you all you need to know.
I have several bottles of the US Future and I have found it is pretty good for canopies, but the Australian equivalents are better for gloss coating. I don't know if they are the best gloss coat but they works fine for me and I won't use any other. Besides I have 6 bottles to get rid of.
Be careful with the Aussie ones from memory we include ammonia in ours which can play havoc with acrylic paints if applied too heavy by brush. I use it all the time and have no problems with it on acrylics if applied in light coats. I used to spray it but find it works perfectly fine with a brush.
The Aussie one are also a whitish colour and not clear like the US version but dry perfectly clear.
Like Malclom said it is an excellent decal setter. The best by a country mile.
You must let it dry for a while on a canopy before masking or you masking may affect it. Leave for as long a possible. It took me ages to figure that one out. LOL