Recipes for putties are given in the Epoxy Book and in our Stitch and Glue manual. Other fillers can be used like milled fibers. Epoxy glue, used for our butt blocks for example, is simply a liquid putty. All necessary fillers are included in our kits. The other important material is fiberglass.
All epoxy suppliers sell that tape.
You can also find fiberglass tape in auto parts store. This means that the fibers are oriented in a certain way and most of the structural properties of our larger boats rely on that fact. They cost more by the area but almost the same by weight. Most sales people in boating centers or resin stores do not know much about these fabrics. You can use household ones but we supply at least 24 disposable latex gloves with each kit metering pumps for the resin.