I am fixing an Airman B260 through hull transducer with high speed fairing on my GW300,I will be cutting the fairing to align the transducer facing vertical.The fairing will not fit in the boat's transducer flats,so ill have to mount the fairing over the flat.The flat underneath the fairing surface will be hollow.I was thinking of either filling this with a wood or sealant. Need advice??