Is used Zspar Captain's over Raka and liked the results.

My tips:
Blow the dust out of the garage out with a leaf blower at least one day in advance.
If you have the space build a polyehelene tent.
Wash the sanded epoxy with ammonia and water and let dry or light wet sand with 120 grit. Caution when wet sanding epoxy you cannot see when you are into the glass.
Dampen the floor before starting application.
Wear freshly washed clothes.
Wear a hat.
Use a 2 inch foam brush.
Thin the varnish 20% max with the manufacturer's thinner enought to give you enough working time. The hotter the air temp the more thinning required.
Wet sand with 220 grit between varnish coats.
4 coats minimum.
Read:
http://www.greenval.com/FAQvarnishing.html