I don't know how it would go on a PF -

"Glass Coat is best thought of as a pouring medium rather than a painting medium.
Flood the surface to be coated immediately. You should aim to pour all the batches (if you have mixed up several) in the first 5 minutes after mixing.
While Glass Coat can be applied with a brush, the best effect is achieved if it is poured over a level surface.
Use a disposable brush or spreader to touch up sides or to move Glass Coat across the surface.
It is important that the surface be as level as possible so that Glass Coat spreads evenly."

source: http://www.glasscoat.com.au/basics.shtml

Although may work with targets etc and other bits n pieces..