Our 30 yr old log home in Tofino on the west coast of Vancouver Island in B.C., needs refinishing. It was originally finished with Sickens Cetol stain. Should we sandblast before refinishing.There is no loose or flaking paint/stain, it just needs brightening up. Also the ends of two logs (12ins. dia.) have dry rot. I have cut out holes approx 2ins.dia.and 6ins.deep in the end of each log. Can you suggest anything I can do myself to fix the problem, or maybe recommend somebody who would fix the p