Although some have stated that vinyl adhesives like Vynabond will only adhere to vinyl, I have used them on composite boats with good success.
For my Clipper Viper I used Vinyl-Tec 2000, which is a vinyl adhesive similar to Vynabond, to glue in all the anchors, including knee and thigh strap anchors, and none show signs of loosening.
Contact adhesive will separate over time when subjected to significant distracting forces, as you found out.
EZ-Dock modular docks
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