i dont know,but any company that responds that fast is a1 in my book.if i got a problem or question about a product and dont get a response i am done with them.
the 476 would be overkill imo,especialy if you are goin to use ocw on top of the werskatt stuff-the water will go into convultions when it hits your car without 476
very good review,i like the poor boys polish also.have used it on glass also.i did a car earlier this year that sat out under a tree for a couple of years and pbp took out all the sap & gunk and i was more than impressed.