Ok, I've been using bulletproof sealer for a few years now but as much as I'm hearing about cobbs impregnator sealer.....I'm making a switch. Seems to me that you can't beat the price and it's a jam up product. Question is, what about countertops...granite, quartz & marble. When I go into a home I normally tell the customer I can clean and seal the countertops for a really good price and most of the time they jump on it. Would it be safe to say that cobbs sealer will do any and all rocks and stones, natural and man made?