Thought some might be interested in a product I just found. It is Epoxy Mat. I suppose most know that regular fiberglass chopped strand mat has a chemical binder that is dissolved when you apply polyester liquid to it. However, when you apply epoxy to the same mat, it doesn't dissolve. Since it is nice to use mat to prevent print-through when you set up a laminate, this has provided a dilemma. I found "epoxy mat" from US Composites in Florida. (http://uscomposites.com/). They apparently stitch it together so it will work with epoxy.
Best Regards
Bruce