Hello There, My patio door was installed about 30 years ago (Everest) and still functions great. But even though I've treated the hardwood surround regularly, the wooden base has rotted in the corners. I've cut off a 2 and a half inch (2 1/2") strip along the whole base and obtained a new length of sapele wood machined with the original profile for it. Can you let me know please what is the best way to treat/protect it -before I screw it to the original remainder of the base.