They claim that this stuff, when sprayed on trees, keeps all animals from browsing for up to 6 months including the winter. The active ingredients are blood meal (99.84%) and vegetable oil (0.16%). Is it correct to assume the purpose of the vegetable oil is to act as a surfactant? If so, would a solution containing a commercially available surfactant (ie Cide Kick) and off-the-shelf blood meal be a viable substitute?