On 23-Sep-2005, "Gene Cosloy" wrote:

Any off the shelf product I've tried very soon becomes loosened and
unattached by sea water.

What you use will depend on what the seat is made of. I've had no
problems with self-adhesive Velcro on ABS and sticking to a fiberglass
seat is not a problem. Polyethylene will be difficult. If you know
the plastic, you can look for the right adhesive. The odds are the
stuff for WW canoes and kayaks should work.

Mike