4. After the putty and first coat of POR-15 paint have dried, you can apply the final topcoat. POR-15 paint is available in several colors, including gloss black, silver, gray, and clear. You can also choose the companys chassis black paint or one of several primers that allow you to paint over POR-15 with any type of paint you want. The final repair is rock solid and guaranteed not to rust again.