I am thinking of replacing the transom of my '70 Grumman v-bottom. The board on there now is pretty soft near the bottom. I don't have a gas motor yet, just a 36 lb electric so I haven't been to worried about it. My question is when I replace it do I just use a pressure treated board cut to fit or do I need some kind of marine grade wood? Also, the bolts are all very rusty and I would like to replace them as well. It looks like there is some kind of sealer around the holes, is this just silicone like you would use for household plumbing or a special type for boating use? I may try and tackle it tommorow or I may put it off and head to a pond for some fishing. Either way I need to do it soon. Thanks for the help.