Not knowing the kind of log that was used is not a big issue. Knowing the stain is. You need to try and find some old cans or possibly contact the ex owner to find what was used. If it has been some time since the last maintenance and the existing stain is peeling, faded and washed out you will need to strip it and start over to do it right. Call Mike at 866-670-3020 for help with this.