recommend an additive for renewing a slightly gassed out can ?

The canned 66 sticks but not as well as a new tube of Locktite or an old tube of Vynabond.

The solvents in it are
Acetone, toluene and MEK.

I’m checking on which is more volatile.

www.sailrite.com has thinner.

Vyna Bond may now be VLP from Plasti Dip or Performix

available from US Plastics

Locally, Loctite Vinyl and Fabric adhesive replaces Vyna Bond. The Locktite is less adhesive.