About Us GNK Painting is a full-service painting contractor that has been building a reputation with Hamilton and surrounding residents since 2004. We specialize in interior and exterior painting for residential, commercial and industrial projects. Our team of professionals have experience in brick painting, airless spraying, epoxy finishes, graffiti removal and wood surfaces, just to name a few. Count on us to complete all projects on time and to your complete satisfaction. Contact us today for your free estimate.