I'm havin trouble with my first infusion where iv got a tiny air leak sumwhere and I can't find it.

Have to agree with Fred, the white plastic infusion mesh is a paint to get to form to a mould and the edges punctured the bag. I went for a short time wrapping the edges in masking tape until I started using a different mesh and not had any problems since

Just one thing I want to add here. There is nothing wrong with easycomposites flow media mesh. You just need to put a small strip of peelply over every cut before you bag. It only takes seconds and you are sure to have a prefect seal. Why take the chance. 
Hope this helps.
Fred