I highly doubt Krowning your car avoids warranty. Some of the sales guys on the forum may be able to confirm that.
Thanks Plenty! They say that if you bring a new car to them (Krown), for a few dollars more, they will get right in there and give it an extra thorough application, if rust has no place to start, it will never be an issue, although I have heard that some Manufacturers might give you a hard time if they (Krown) drill holes into the car and spray inside and plug the holes with plastic plugs?
Sorry for wondering off topic a bit, but as you can see, I hate rust and resent what it has done to previous cars that I have owned