I purchased a 1979 browning  17' 6" project boat off of this guy with the intentions of just replacing the motor and running it down the lake.  Once I got into the project i realized the soft floor around the walk thru area.  So I made a few test holes and I found rotted ply.  with a few cuts of a skill saw I made the assessment to replace the whole deck.  In the process of replacement the saw was set a little deeper than 3/4 of an inch and I made a cut through the hull.  Biggest part is I didn't know what to do about the hole.  Well i started searching around and found MAS Epoxies.  I used a combo of heavy glass matting and light glass matting to repair the hole in the boat.  I also used the Flag Resin and medium hardner on the deck.  Now she's good as new and I'm out on the lake enjoying life on the water.