A fellow I knew built a Jodel years ago, (they're all wood), and a set of wood floats. Plans for both were available from Falconar Aviation in Edmonton.
He flew the package for years with nothing more than good inspections and regular maintenance. Anytime he nicked the floats he'd repair them right away. Regularly he inspected both the float and aircraft structures. He used varnish in the interior of both the floats and aircraft. I don't know what he used for adhesive. The biggest complaint he had with the entire package was the capacity of the floats. On the odd occasion that he buried the front of the floats he would always say that he wished he'd of enlarged them. I'm trying to remember how long he flew it. It had to be ten years at least before he lost his medical. Falconar Aviation is now Falconaravia. Google them, they're still in business. Chris Falconar himself is now retired and the new business doesn't show the float plans. Call them anyway and see what they say. PS, My aerobatic instructor was the lead instructor at the time I was flying in the forces. It's his SAL 2/3 Mustang that is pictured on the website. It's flying over Old Wives Lake south of Moose Jaw where the Snowbirds are stationed. I got a couple of hours stick time in that machine and it changed my perception of flying forever! Hope this helps. Peter Johnson Kenora, Ontario