I am having trouble coloring a polyester with black color. It seems that if I add too much color the polyester gets gummy and difficult to mix. I am trying to mix a deep black to match a repair in a black absolute granite, any suggestions?

If you mix too much color with polyesters they will get gummy. I would suggest purchasing a black polyester. These are available from your stone chemical supplier.

You may also want to try using an artists oil color called “Lamp Black”. This is very concentrated color which may work better.