I'm not trying to start an argument, just spoke from my own experience, obviously people are free to choose whatever they wish to use. If 291 works for you (and to be fair you have a lot more surface area than I do with just 2 small bigheads per stay, and less stress if the rear stays are drilled and bolted) that's good news. Sika 291 spec sheet - Fast Cure Marine Adhesive and Sealant Areas of Application: - General all - purpose sealant - May be used for light duty – bonding Sika 292 spec sheet - Structural adhesive for marine applications Areas of Application: Sikaflex® -292 is suitable for structural joints in marine constructions which will be subjected to high dynamic stresses. Suitable substrate materials are timber, metals, particularly aluminium (including anodised finishes), metal primers and paint coatings (twocomponent systems), ceramic materials, plastics such as GRP (unsaturated polyester resin), ABS, etc.