Propylene Glycol (known as Up Adjuster) is a nearly odorless clear liquid. It is used as an emulsifier and fluid density adjustment additive in lamps made prior to 2003. It will increase the density of the fluid and make the wax more pliable to help aged lava wax float again. For most lamps up to 52oz, Use @1/2 oz at a time and wait 1/2 hr