Bonding Hull and Deck

[3rdday]

My 21 is also riveted and glassed just like Terrys, again no separation or delamination after 40+ yrs.

My business is structural adhesives, bonding dissimilar substrates, and difficult to bond applications.I consult with OEMs and Mfg on assembly challenges.

Here is the process if you wast the absolute best possible joint integrity;
Use the Methacrylate adhesive in the hull to deck joint, it will be a more successful adhesive than polyester, vinylester, epoxy, polyurethane(3M5200,Sika,Boatlife, Bostik etc.) MMAs will handle 1000s X more fatigue cycles. Glass the joint with FG tape and epoxy, then rivet.
Do This only if you plan on never removing the deck from the hull.
Additionally before you rivet you could "back" the joint with a 1/4 aluminum strip, and rivet through that.