Eagle90
.......That's 2 people who have mentioned Alclad,.........
Make that 3, Eagle. I use it too. Be careful if you find an Alclad display at your LHS, you're looking for ALC-310 Klear Kote Gloss.
Alclad also has ALC-600 Aqua Gloss Clear which is acrylic. Works fine, but don't think that is what you are looking for.