They do the job ok, once you go over it several times. At work we use a different brand that is more of a chalk, it is much easier to use because you can go over the tire once and it leaves a nice bright mark. I found that these don’t work at all on tires that are dry rotted, and when they do mark the mark is very dull. In addition, when you want to remove the mark, you will have to scrub it, even if you use brake cleaner At work, the chalk marking material we use just comes right off with…