last person I heard say something like that in public got a letter detailing a £250k lawsuit asking them to prove it in court as you are publicly slating their product. Do you have £250k? Be careful.It's Chronic that has the staining paint...
We used Ultimate and Chronic all last year (and Zap for many years before that) and I never found either to stain. In fact Zap was one of the products that passed the tests for staining.
In fact I don't have anything I own that is stained. If you wash your kit when you get home the evening of finishing a tournie, I can't see anything staining. If you leave it to fester in your kit bag cause you are a lazy ar$e it may leave a mark.