Ranked as one of the top concentrate products. The wax liquidizer has gotten lots of positive feedback and reviews from satisfied retailers and consumers alike. Wax Liquidizer and terpenes is a PG(Propylene glycol) based quick fix blend that includes a handful of levels of PG. Some of which include PEG400, PEG200, and PG. Accredited and licensed by the FDA(Food and Drug Administration), PG is added as an ingredient in the production of many babies, food, and medical products. PG is also regarded as generally safe by the FDA.