The actual silicone delivered from this canister is excellent quality and performs well for preventing vibration induced loss of mechanical items. However the delivery valve and mechanism leave a lot to be desired. I use small quantities over a number of weeks and after about 5 screw-on-screw-off uses, the threads on the valve begin to overhaul, the valve fails to shut completely with consequential hardening of the silicone in the dispensing nossle and necessary removal and shoving a screwdriver into it to unjam the solid material.