DS: Has anyone used this for dog show grooming?

I have not used this and don't use chalk because I'm afraid a picky judge will say, "Get out of the ring". This looks like a great idea because it says it doesn't change the feel of the coat. I've been lucky so far but a friend just had her dog chew up a permanent marker right before a show. As you said, her dog is still her dog but she would either have to cover it or no show. We all say we don't like it when people no show. I'm glad you posted. I had not heard of this product before.