If you decide to use mat, remember that most of it is held together with a styrene soluble binder. Epoxy will not dissolve it - if you are using epoxy you must get mat that is specified for that purpose - it uses a different binder.
It is correct that there are different binders. It really won't make any difference if you are using the very thin layer I am suggesting for this application. It would be an important consideration if you were trying to get a full thickness layer of mat to conform.
Thanks for keeping it accurate JonB.