As Matt mentioned, this has to be a habit - when I use a plane, I break it down, blow it off and spray it with the Camelia Oil before putting it back in the plane rack. Many of my other hand tools live in a tool box or hang on the wall and I will spray them periodically, but not as "religiously" as my planes. When I see rust (the brown haze start, I will take a scotch brite pad and spray a little oil on it and rub the rust away, wipe it with a microfiber towel and spray it again before putting it away...