Here are some photos of the transom and thrust board. They are in good shape. No rot. Just need to patch some holes, particularly around the motor mount on the transoms top edge. I was going to use West System silica filler for this. Do I need to remove all prior paint or is it good as is? I would like to cover the Epoxy with a matte UV resistant paint. I'm fine with spray paint if it achieves this purpose and is UV restart enough. I'm trying to bring it back to original condition and these all came with matte black paint. There does not appear to exist matte varnish so it'll have to be paint.
Originally Posted by captnjack
I have successfully used the water viscosity epoxy from west marine as a sealer (not on a transom but a teak deck). Even 1 part polyurathane paint would be fine as a top coat. Much simpler to apply than 2 part anyway.
You didn't post any pics but chances are good the transom is at least a little delaminated around the edges. That can be fixed with clamps at the same time you reseal it. Just inject some epoxy into the core with a plastic syringe. West marine and other yacht or fishing supply places even sells plastic syringes for this purpose.
ps there's no such thing as "marine grade" plywood here in the States (I have no idea about the UK). There are interior and exterior grades, but all exterior grades use waterproof glues and none of them are specifically rated for marine use. So if you are trying to replace the thin "pad" of plywood on the back of the transom because the clamps have chewed up the old one... You can grind off the old pad and reglue on a peice of exterior ply from Home Depot etc. Then seal + paint the whole thing into one solid wood cored black transom.