It's not a bad idea. Basically, he's putting some extra mass between the screws and the hull, so the screws don't go into the hull gellcoat and fiberglass.....not a bad idea really. But truthfully, $60 for some epoxy and a 3x4 inch piece of starboard is a little pricey for my blood. I wonder how a piece of Teak would work?  I'm sure there are other materials that will work just as well, and for a cheaper price. In all cases I'm going to try to mount my 2 transducers inside my hull and shoot thru the bottom.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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