I used the Zero paints one John. It is actually three parts. Clear, Hardener and Thinner. I am a bit concerned about the safety issues around this as you are spraying a plastic in effect which 'gasses off' as it cures so needs careful handling and good extraction plus mask.
It is a 'hot' product and they recommend a light dusting over
decals to seal them followed by a slightly heavier coat after a few minutes and then a wet coat which gives the shine. This is the nervy bit as the second coat may be orange peel looking, it is that wet coat that 'melts' the previous coat and gives the great finish.
It may have been beginners luck but, although not perfect, I am really happy with what I ended up with. I have never achieved a finish like this with anything else.