I ordered a six pack of Krown rust protection spray. It’s the second time I’ve done this. Krown is popular in Canada and the spray is a yearly applied product. This year I was pleasantly surprised the cans have an “Inverta spray” nozzle on it so it can dispense upside down and sideways making it easier to apply while crawling underneath the vehicle. Here is a pic of the old product along with the new one. I found the product I applied last year is still present. A good test of the product was on my trailer hitch. It was rusting each year and I would hit it with black rust paint. The rust would return in the spring. Last year I did the paint job again, then sprayed it with Krown. The rust did not come back. There are plenty of products out there but this one works for me. About 10 bucks a can. Enjoy.