3M Rubber Adhesive glue for Neoprene Gaskets.
Spray one layer on the part of the gasket that is facing towards the gasket edge, and one layer in the gasket edge. Let it dry for a couple of minutes before inserting the gasket.
This is a stock item, and is available for shipping the same day.
NB: This container is pressurised and is therefore not available for air shipping unless a special shipping method is applied (added cost).