Hello, I have been working many years with the unimould system but now I going over to the High Temp mould system for the xpreg prepregs . 

I am laminating the mould with 1 layer 100G woven glass than 1 layer 280G woven glass after this I let it set to gell 
han I put 2 layers of 400G woven glass and stop with 1 layer 100G glass to finish.

Are this enough layers for the moulds ? 
And also "why I dont like epoxy " is there a way to not get the air coming up to the high spots in the moulds . 
I make superbike fairings and they got alot of shard , round edges and when the glass and epoxy is just layed down , I dont got any airbubbles but after time the wil show up at high spots . 

This is why I first put the 100G and 280G and leave them to gell first . 

No, the best way to do it is to continue when the gelcoat is cured to it's b-stage. The only, and less strong alternative is to cure the gelcoat completely and then key it with sanding paper.
You could let the first layer of light cloth cure to the b-stage before adding the heavier layers, this helps spotting the air pockets. The fill the corners, so the heavier cloths are easier to put down.
For smaller moulds,  your ply stack will give sufficient thickness to the mould.