I am trying to mount my Lowrance fish finder transducer for my Old Town Guide 147 canoe. I have the finder unit attached to a strong spring clip which is easily attached or removed from the thwart, with the power cord running to the 12 volt battery, however I am reluctant to cable or zip tie the transducer to the bottom of the trolling motor which is mounted to another thwart like mount on the port side. I have read about using duct seal in the bottom of the boat to form a cup which when filled with a hand full of water would hold the transducer fast and permit the signals to operate correctly thru the polyethylene hull. I understand that the Guide is 3 layers of polyethylene. Has anyone attempted this? Would all the phases (down scan, chirp, sonar, etc still work) or are there air gaps between the layers that would prevent proper operation? If this worked it would be easier for me to attach and unattach everything for carrying the canoe on the roof rack, and possible reception problems created by the trolling motor, since it is an older unit.