I used 60A Polyurethane Rubber, I'd go for 80A, which is a little stiffer if I were to do it again. Here's a link for the 60A mix: www.ebay.ie/itm/230758928539?mkcid=16&mkevt=1&mkrid=5282-175127-2357-0&ssspo=wsz8gv2bRKe&sssrc=4429486&ssuid=hbe5wbr5syg&var=&widget_ver=artemis&media=COPY