Is there method to painting iron accessories and metal doors by just immersing in chemical solutions (final coatings too) without
using brush or galvanize ?
And if it exist ,is it good method for paint steel doors and parts ?
Henkel has a process called Autodeposition. Gives you a black paint coating with a dip or spray on steel parts. My former employer used it on backing plates for drum brakes and housings for vacuum boosters.