I have a community sign made of red cedar logs. Some are verticle and some are horizontal. The sign has been up for 15 years and the vericle one has a dryrot whole in it the size of a fist. it damp inside how can I patch it quickley before the rains comes? Can I put a cedar shingle over it and hope it dries out inside. I want to treat the logs with Seikens before the rainy season the horizontal logs have dryrot in some places as well how do I treat that? Any advice would be appreciated. Thank yo