Hi all. I recently glued new shock mounts to a shell chair. Used JB-Weld, widely recommended. The adhesive stuck to the fiberglass extremely well, but when I sat on the reassembled chair, two of the mounts popped loose from the epoxy right away. (The epoxy itself stayed bonded to the shell.) Has anyone else had this problem? Did I overtighten the screws, maybe?
Very surprised at this: I'd understand adhesion problems with the fiberglass, but not with the new mount, which is clean and has a crepey surface.
This is what I do.
I take a knife and scratch the hell out of the shock mount where I'm going to glue. Roughing up the surface really helps it to stick. And you don't want to push the shock mount too hard against the shell. Pushing too hard will push all of the glue out the sides. Also, it's best to do this at room temperature. If your shell and mounts are too cold, the mounts can pop off more easily.
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