I dont mean to belittle the epogrip people, but, if you want an epoxy to stay where you put it and not run down the joint. Do what I do. I just mix some Cab-O-sil with it. ****701 Cab-O-Sil: A lightweight, fumed silica thixotropic powder which is added to polyester/vinylester and epoxy resins to make a non sagging paste to prevent runoff and sags on vertical surfaces. Also, used as a thickener to fill surface holes and flaws**** That is what its made for. Turns liquid epoxy or polyester for that matter into a gell. to add some extra strength to it also, you can also add some milled fibers to it.**** 703 Milled Glass Fibers (1/32) milled glass fibers are short lengths of reinforcing glass that may be added to any resin system to increase their strength. Often used in conjunction with Cab-O-Sil or Glass Microspheres to make high strength putties***** These are basic additives to people who are in the "business" and not largely known throughout the general users of epoxy. Check with the local guys that sell West systems or any other industrial suppliers. They will have both or should have both on hand to sell you. Alot cheaper to buy your own additives and mix as you need instead of buying a high priced single application. These are my thoughts, facts, and experiences over the years Ive been doing molding and modeling.

Here is a link to what I mentioned above along with prices. Hope this helps. http://www.lbifiberglass.com/FAIRCOMPFILL/faircomp.html