I degassed my new coating resin yesterday and it worked out perfectly even brushing it onto the part I had previously skinned in CF, thank you guys.

thanks carboncactus thats very useful, maybe the process is quicker than i thought. Im going to have to experiment some more. 

I guess it is technically "boiling", as youre lowering the air pressure, therefore lowering the boiling point. This happens somoetimes when you infuse with polyester.
When you degass, air will be evacuated fairly quickly. It's a 2 minute job, once you see the resin start to foam up and rise, stop. Let it settle, then evacuate a bit more. If it doesnt settle, air the chamber and youll see the resin flatten almost instantly. Pull some vacuum again, it should rise, but not so much. This is enough, if you start evacuating the styrene youll end up with a thicker resin, making the job harder for yourself.

Do degass your resin,you are going to introduce some with your brush,but when you mix your resin then degass you can see how much air your removing alot.

thanks for the feedback guys, in that case I will not bother degassing the resin as I will be applying it with a brush.

Carboncactus,

i have just been building a degassing chamber for this very purpose as i was finding tiny specks of polish getting into minuscule holes in my finished ( hand applied )  coating causing white speckles. I havent tried the degassed resin yet so i cant give a full answer however i can say that i was advised that degassing may be a rout to solving my pinhole problems.

I dont use a vacuum chamber or pump in any other part of my hand layup process.

I would like to know however as i'm new to degassing is it normal for the resin to get worse before it gets better in the degassing process. I find that when i add heavily stirred ( big bubbles) resin to my chamber the big bubbles quickly go but are replaced by tiny ones that take a a further 10 minutes or so to finally rise and pop in my chamber. is this normal or do i have a leak or something causing a problem ?