No, you miss read me. I wanted the polyurethane but went with the epoxy instead - no aluminum filler. A slow setting epoxy that never really reaches complete hardness but stays flexible. You are obviously way ahead of me on the dynamics of the matter. What was the nature of the metal cracking? And where did it occur? I don't have any evidence, but I would think a barrel without taper would be better _ no 'wedge' effect with both heat and expansion. Have you looked into polyurethanes at PolyTek? Good people.
