Almost every time we must act on a screw corrosion has done its work and makes the operation difficult, if not impossible ... A "little" kick WD40 penetrating oil can help .... Within minutes the product is and allows us to do the work planned .. This product is more expensive than other brands, is so effective that most professionals use, for example we use in my business to enable us to facilitate maintenance of our machines ... I used me to grease the moving parts of the doors and the trunk of my car to protect them from moisture, the doors of my house and the hinged windows application per month is sufficient. For an application locks a month in winter're avoiding that moisture will stagnate and will freeze.
