Exposed untreated pine shiplap siding / Pine tar

Can I leave the back side of pine shiplap siding permanently untreated ? And the front side untreated for 12 + weeks ? I’m getting close to installing pine tar coated… Can I leave the back side of pine shiplap siding permanently untreated ? And the front side untreated for 12 + weeks ? I’m getting close to installing pine tar coated…Read MoreGreenBuildingAdvisor