Goo Gone works great and WD-40 should do the trick as well.

: In my last minute haste to put a temporary seat in my Night Heron (to try it
: at the DelMarva Paddlers Retreat) I made the mistake of using some
: "industrial strength" velcro from Home Depot (Brian, I know,
: that was stupid). When I removed the velcro, all that was left was the
: adhesive goo. Any tips on how to remove this without using toxic solvents.
: It's attached to varnished epoxy on the hull interior.

: Len Thunberg