Very often sealants are available in custom colors. Some customers will make you a certain color, but you have to buy a certain minimum order quantity, and that sometimes can be high. It depends on how much custom color you need in the specific job that you’re talking about. There are some other ways of accomplishing that.
Some manufacturers have what they call color packs that allow you to mix custom colors on a much smaller basis. For instance in a 1 ½ gallon type system using color packs in order to achieve the color that you want. There’s a couple of different ways to do that.