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.
Article ID: 1147
Created: February 5, 2026
Last Updated: February 5, 2026
Author: Dev
Online URL: https://surfacecarepros.com/kb/article/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-1147.html