I had no Idea about that WOG but it makes perfect sense. I went back to Lowes today and exchanged those sheets for the same sizes in FIR exterior Ply. Thank you for giving me the heads up. Would have never known. I used the old peice of P treated wood for a model to cut the new pieces and followed this process.
Cut all three to shape. Format: 3/4" - 1/2" - 3/4"
Clamped together to got the perfectly lined up
Took a grinder to all the edges to make them all flush and smooth
Made three rows of 3-4" inch spaced screws to hold the wood in place during the gluing process and then to later be turned into "ooze" holes for PB
Inserted new transom into boat and tested for fit, clamped it in and traced the motor indentation to be cut out
Sanded inside to make flush
Disssembled and glued piece on to piece two (3/4" to 1/2"). Put screws back in.
Later today I will do the third 3/4" layer and then It will sit and cure over night. Tomorow I will sand the glue drippings from the sides and make it ready to suck in resin. Thanks WOG, I didnt know if it was pure resin that I should put in to just fill the wood so it wouldnt get thirsty when glassing it. I am not to savvy with fiberglass materials at all but I am going to practice a bit before I install the transom.
Question: how thick and viscus should the PB mix be when applying it to the back of the transom?
Def a good call Pusher with the PT wood. Never thought of that but it for sure makes sense.
Hope yall had a great day.