Join Date: Jul 2008
Location: chesapeake bay
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simply the best way is solid fiber glass, second best is ply or wood.
glass is easy, as you say clean the area. then out side the boat make up a "stack" of wetted out fiber glass squares or circles. make sure to not over saturate the glass then run the stack into the boat and apply while still wet. then let cure over night. then drill
but if this is for a depth ducer you dont need to drill it into the hull if your hull is solid. you can do several other things that work just as well