garagedoors4u closing products are designed to require minimal maintenance. Nevertheless, the movement of the door necessarily implies a certain wear: the lubrication of the motor parts is therefore recommended regularly.To avoid corrosion, the panels of your garage door are made from two galvanized steel plates, with a polyurethane foam injected between the two.Galvanizing is a process of covering the steel with a thin layer of zinc (stainless steel) that protects your automatic garage door from corrosion.SMF also provides you with maintenance contracts, allowing a longer life, and an extension of your warranty.