Thank you for your reply. The 'fiberglass' that is behind the wood appears to go all the way form top to bottom(i can see it when i take the centerboard trunk top off and look down) and is on both sides.(removed some rotten wood form the other side while i was at it.) I believe i've removed all the rotten wood, (went out in a circle with a hammer and wood chisel till i hit hard wood on all sides...) My intention was to put a layer of resin and fiberglass on top of the 'fiberglass' backing that was already there, and then replace the wood that i took out. My other thought was to just replace the whole bottom board, but as you'll see in the photos, there are lag bolts coming up from the bottom, and being that they are inside the fiberglass on the bottom, i have no idea how i would get them out to replace the bottom board....
Also, i was wondering if anyone would have any recommendations on how to get the wood dried out quicker. The sooner i ould get this repair done the better, so i can get it back out on the water to see if it holds up, or if i have more work to do.
towards the bottom of the second image you will see two gery areas. The grey area is the steel centerboard behind the 'fiberglass'