I have used some cheap spray glue to hold my carbon reinforcement in the mold whilst laminating up

Not alot just a quick squirt

Yes its gone off and hard but you can peel the laminate apart

so be warned,!!!!  

I will be getting the real stuff when available :-)

The cheap solution until a decent spray tack comes back in stock is to mix some infusion resin and thin it down with methylated spirits and spritze it onto the mould/fabric to hold the fabric in place.

Being the right resin to start with, it will be fine for infusing with and shouldnt react with anything.