I am compiling my materials list for a Yost-style SOF. The ply bulkheads I plan to coat with standard West System epoxy (105 resin, 206 hardener). I ran across their new-ish product, G/Flex 655 thickened epoxy adhesive. It sounds like it might be better for the frame-stringer joints and wondered if anyone had any experience with it, positive or negative.