Wish my thread had a new name like long term RP-342 Cosmoline results or something like that.
I don't know about other wax products, I'm only familiar with Fluid Film and RP-342 Cosmoline long term.
I first applied RP-342 Nov 2018. Just before winter. Used 6 cans. So far, rusting has paused wherever RP-342 has been applied. Its amber colored, collects no soot layer so you can see through it. Creates a patina on open rust spots. You know nothing is happening under the layer. Because you can see it. No chips or flakes like I experienced with FF.
Ive been monitoring this rear stabilizer bar bolt. First pic is 9 months after FF spray. Completely washed off.
The second is 10 months after RP-342. The surface just looks wet, patina is the best description I can come up with. Did not wash off. Water beads up and the undercarriage stays clean.
Also note on the axle where the Fluid Film flaked off. The RP-342 has created a patina on that as well. I did not retreat the areas this year.
Note: when it's real hot out I can smell it a little bit. Like its alive lol. I think its softer in the heat and moves around. Also I got some overspray on the exhaust. Took a month for that to burn off. So its flashpoint must be pretty high.