Hull Deck Joint

[schooner]

Since I have the rubrail off to paint the hull and deck on my 1985 Sceptre and was wondering if I should take the opportunity to put some additional rivets or bolts in the joint.

There are no indications of any problem other than some creaking when running in a chop. It looks like it is mainly fastened with screws and a rock-hard brown putty of some sort.

Just because I have the rail off, I was wondering if driving a rivet every 12 inches or so would be worthwhile. If so, any advice on size and material - aluminum or stainless? Source to buy?

Thanks.