Beware of anything with Hydroflouric acid - this stuff will removed the calcium from your bones right through your skin - enough decalcification requires amputation of the affected parts. This problem was seen in the 90's with some car interiors that when burnt and then hit with water,would create the acid, unrealized by scrapyard workers, and they lost body parts from it. If you must use these chemicals, get the right PPEs for it - acid gloves, apron, goggles, and acid rated respirator and good ventilation. Don't think that this stuff is harmless - don't want to see someone injured from chemical exposure.