I applied this primer on August 24th (2021) using a Surface Shield sprayer bought on eBay. Today is December 18th, 2021. The primer is holding up very well so far, as you can see in the photos here. I'll update when a full year has passed because I want to see if it lasts as long as you guys. , but that's because I run it through tunnel washers with a bottom washing function. So beware buyers, DO NOT use an underbody cleaner until winter is over! I am attaching a photo of the front subframe…