Its is pine tarr, And yes, That odor is very distinctive yet was very effective as well as controlling the black flies, Did a lot of brook fishing back in the 70's in the Jackman area and woodsman and cutters was always a part of the supply chain.
The two brothers I needed to ask were not there tonight at our meeting as they’re out straight this time of year and all year other then springtime when DOT has weight limits on the roads, But I will get an answer to what they recommend when I see them.