I tried doing something similar to this once pouring Polycrylic onto a pf like I was baking a cake. It really didn't turn out that bad but using pure acrylic is not recommended it's way too brittle when it dries. You want something that is soft but hard and most enamels. lacquer and modern 2 part urethane clear coat systems are just too hard, when you're wrenching on your pf it will crack and creek like you were in a haunted house...hence all the clear repair kits and stuff. I have not yet seen a automotive grade 2 pak urethane clear coat system that is either too hard or too soft.
Spraymax2K is a perfect blend of soft resins and tough acrylics and is just perfect for playfields, it wont dimple on a ball drop up to 6 feet but will dimple over that which is what you want instead of it cracking! You can drill into it without fear of cracking. Essentially its the same recipe as bulletproof glass. This is all I use to clear pfs and my customers love it as much as I do, it's been on all my playfields and I've tested it extensively with over 1K plays on my PZ documented here on Pinside with not 1 dimple or crack in the finish!