I have tried spraying varnish, and its not easy. Roll and tip for a quicker finish and deeper shine. With three coats a day and using Epi you will have REAL problems with solvent entrapment. Epi is a pain in the arse at the best of times being really slow drying, and to be honest, far to expensive to be loseing some of it to the atmosphere! One coat a day is a realistic target, and rolling/tipping will give you an equal build-up.
I have tried accelerating Epi with driers but it just won't play ball. In fact I only use it if the customer has insisted!
Crusty-Eposeal, like most epoxies is not UV stable, and needs covering with further coats of somthing. Its a good foundation, IF you can get the following coats to stick to it.
EDIT BY DAN F: Sorry I've had to remove the picture because it's too big and breaking the forum template. Please use images no wider than 300 pixels, www.resizr.com is a very easy, free tool if you need it.