Over time drain pans become corroded, develop irregular surfaces and rot. You can avoid expensive replacement and extend the life of the pan dramatically. In fact, the surface becomes better than a factory installed pan. The products that we use form a durable level pan, eliminating low spots that inhibit drainage. It automatically fills the pits and irregular surface characteristics, providing a smooth, enamel finish. The enamel is impervious to the harsh coil cleaning chemicals that rot out bare metal.