tarheelpwr
Member
I've heard of this rust product (forget the name) that's a wax. It requires a special gun that will heat the wax into a liquid so it'll actually spray.. but (obviously) when it's dried its miles more resilient than any of the fluid options. Apparently the first application is around 800$ for a full size truck, but yearly touch ups cost about the same as one done with fluid film or rust check etc.. around 150$.
I really like the sounds of it. Keep meaning to find a place locally that does it.
Talked to a local applicator today. He recommended the NHOU oil product. Here’s a link to their site to find a local guy.

Find NHOU Vehicle Undercoating Near Me
Find qualified factory trained professionals for your next vehicle undercoating services. Our team is here to help with any questions or concerns.

I may have gotten lucky, but my local only charges $225 for first year and $175 each follow up.