Looking at a log house for sale built in 1981 , talked to previous owner who was actual builder he also built ten other log houses in my area about what he stained and or sealed outside logs with . He told me he mixed his own solution of diesel, parafin (sp) wax, some uv blocker and some other stuff he treated every five years, logs look great no sign of rott or strange coloring. I no you don’t approv using diesel as a sealer so my question is how bad is it for the logs,are ther any health iss