A very high quality epoxy and covering with sealant/good paint. My house I just bought had some now obvious coverups using a cheap wood putty. About a year lat

A very high quality epoxy and covering with sealant/good paint. My house I just bought had some now obvious coverups using a cheap wood putty. About a year later all of that wood is continuing to rot. In my case the expansion and contraction broke the paint and allowed water in and so the rot continued