You betcha! Follow the same cleaning procedure shown above. Assuming you are refinishing because the wood is weathered and needs finishing the Hemp Shield will penetrate the clean dry surface everywhere it is open. On spots where some of the older finish may remain, Hemp Shield’s deck stains will coat and help preserve that surface also. I would not recommend Hemp Shield over logs where the old finish is glossy. This will keep the Hemp Shield from working since it cannot penetrate into the wood. If you want to use Hemp Shield and the logs still have a good coat of the previous finish on them it may be necessary to remove the finish with blast media such as glass, walnut shells or other media.