What type depth finder do you have?
mikehoyt writes: "I have had a fishfinder bulkhead mounted and because it came with the boat with a transom transducer tried the epoxy inside hull method. Worked well."
I''m not sure I understand. Are you saying that rather than mounting a transducer designed for transom mounting on the transom, you instead epoxied it directly against the inside of the hull, presumably in the bilge area? And that you had good results with this arrangement?