The International Cessna^® 170 Association

I had my plane treated with Boeshield which is a Boeing product very similar to Corrosion-X and ACF-50. The shop who did my plane said in order to prevent or at least minimize weaping of the product from the plane, don't over-do it. Use the lightest fog you can and move thru the plane fairly quickly. Then repeat the treatment every year or so depending on the environmental conditions where the plane is stored and operated. Used properly it won't build up a messy layer.

As Steve previously noted, a small drop will grow to dinner plate size in a few days, it doesn't take much. This stuff creeps into and around every lap joint, rivit head, and coats sheet metal with a microscopic layer of dielectric film (insulator) that prevents electrolyte (usually moisture) from producing a corrosion cell between the metal and oxygen in the air. It will also get between existing corrosion and metal and stop the progress of the corrosion. It can literally save our planes, IMHO.
Richard

I treated my 170 this summer with Boeshield and a $6 sprayer from Harbor Freight (the type with the screw on 32 oz reservoir.) It doesn't have a long wand (8"), and I don't think you need one with enough air pressure. The sprayer has an adjustable venturi tip that you can lean or richen the mixture with. So, fairly rich blasts down the wingtips, and leaner fogs inside the tailcone and inspection covers.

I shot the stuff as fine, highly accellerated mist into the most inboard inspection holes and it came out the wingtips like smoke. The tip is small enough to position at the hard to reach vertical and horz stabilizer holes, and a powerful blast coats the mist on all the internal surfaces.

The hard part was shooting it down the tail and having to be trapped inside the fuselage with that fog. I didn't do the smart thing and buy a respirator.

The stuff did spooge out for a few weeks afterward.