Fully synthetic formula is PTFE-strengthened, O-ring, X-ring, and Z-ring safe, Sprays on with a light viscosity then sets up with a thicket viscosity, Easily portable 56 ml sized aerosol can is refillable from the larger 500 ml size can; 56 ml can holds approximately 8-10 applications and then the aerosol nozzle "mates" with the 500ml can, allowing easy refilling, Available in 500mL aerosol cans