I wish I would have known this before purchasing the kit. There are labels on the 2 bottles of clean/prep product with a warning that there are ingredients known to cause cancer in the state of CA.
There's a 2 page photocopied instruction sheet included with a detailed Q&A section, and warnings not to breathe in the fumes, or get any on your skin.
It's not difficult to be careful with the stuff, wearing the included gloves helps considerably. But it's still concerning to me that there is a known carcinogen in the product.
That aside, the stuff works GREAT. I mean, AMAZINGLY well. Dries more quickly than the instructions say, but I still have it PLENTY of time to make sure it was dry and safe before I touched it and painted over it. When you're done, the rust spot is a rock-hard piece of black metal, ready for painting.
Great stuff, I hope they can come up with a new formula that's a bit less dangerous.