ACF-50 anti-corrosion formula should be applied every two years with treatments being timed with the aircraft's annual check. When applied, ACF-50 creeps into the tightest seams, lap joints, micro cracks and around rivet heads, displacing moisture. Active inhibitors penetrate to the base of the corrosion cell where it emulsifies, encapsulates, and then lifts the electrolyte away from the metal surface. ACF-50 leaves a barrier preventing further corrosion for 12 months. Simple to apply, either by cloth or spray, ACF-50 should be used by all pilots or maintenance facilities. For 16 years ACF-50 has been protecting aircraft for commercial fleet operators, the US Government and GA owners world-wide. O.E.M. Approvals include Boeing Aircraft, British Aerospace, Sikorsky, Bell, Raytheon, Gulfstream and the US Military."Using ACF-50 puts corrosion in a permanent holding pattern!"