Hi this is not my first part but i keep messing up when mixing up the resin could sumone please help me with how much resin i would need for a flat part measuring 3ft x 2ft made of 200g carbon, 3 layers of 290g woven glass,peel ply and mesh?

Thank u warren I'm going to give it all a go 2day any other tips b4 I start 

With infusion the key to perfect parts is a combination of things. The critical one being a perfectly sealed bag. I know how hard and frustrating this can be. Even the smallest of leaks will have a negative effect on the surface finish. When your starting/learning don't start the infusion without a perfect seal no matter how tempting it is to "give it a go" you will almost certainly be disappointed with the outcome and waste expensive materials.
With experience you can make a judgement call. If the leak is tiny you are unlikely to find it until you introduce the resin, this is still risky but does work. Start the infusion, as soon as the resin reaches the area of the leak you will see air being draw in indicating the leak point. Most small leaks are caused my a punctured bag so start applying small pieces of gum tape to seal the hole. You have to work quickly and as said is risky.
The other main issue is bridging, ie where the stack is not against the mould surface, tight corners, recesses etc. These will leave voids that will either fill with resin or leave dry areas. either can ruin the finished part.

Good luck and let us know how you get on.

Warren

Carbon Copies Ltd