The #1-selling penetrant since 1957, PB B'laster quickly busts loose rusted or frozen parts caused by rust and corrosion. It also contains a non-evaporating lubricant that saves time and equipment and protects against further rust and corrosion. Clear formulation prevents staining on sensitive surfaces. Low Order formulation allows use in low ventilation or indoor spaces. NSF H2 Food Grade Certification increases potential applications. 360 Degree Bag on Valve Spray eliminates loss of propellant spray out issues - users can use every last drop.