I just try to use small screws to hold canopies down now. Used to use epoxy with success, but it takes much care and patience and then I would have to put trim tape on to cover the ugly edge all around. With the screws, the edge is cleaner, and I can gain access to the cockpit again, or replace the canopy easier, etc. Of course this only works where the canopy lays flat enough against the fuselage here and there for the screws. I like the contact cement suggestion...might need to try that one in the correct situation. Jon