Our log home is built with tongue-in-groove logs which sit flat on each other with afoam gasket seal. The seal has deteriorated so we need to caulk or chink, also around all windows & doors to fix a couple of water leaks. Then we would clean the logs & stain. The gaps between logs are at most 1/4”. What material do we put in here to seal? Can you suggest a contractor in southern NH who does this kind of work?