For the clear coat have a look at this product .

http://www.kbs-coatings.com.au/KBS-Diamond-Finish-ClearCoat-_p_30.html

I have seen 2 guys playfields now, done with this and you sure wouldn't know it was a backyarder job done with a roller (or brush) .

There's a couple of threads on Aussie Arcade about it , can't remember if its been documented here or not .

I intend using it on my Black Hole when I finally get around to working on that project.