Our house is actually an old barn built around it. However, the corners were left on the exterior to create a covered porch. We orignally treated with Penetreat and borate sticks in the ends. And finished with a colored finish, I can’t remember the name of. My question is, what can I re-coat it with? It is looking dry and the carpenter bees are drilling into it. I was told to paint the beams to deter the bees, which is fine but I need to clean and re-treat with a good sealer/insecticide/so