In the 90’s my HK USP40 came wrapped in a plastic bag (inside the HK box) with a thin coat of this all over the metal parts, and an instruction card on how to clean before use. (I have a vague recollection the instructions said it was a cosmoline gel to keep the gun rust free prior to use.)
Pain to clean off. Only gun I ever bought that came that way. Worked though, metal parts perfect.
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it was the first time I used it and honestly the stuff I bought can only be purchased in hood old rattle cans. Neighbors probably thought I was nuts crawling all over under my Wrangler and spraying everything.
What I liked about it was Fluid film never lasted the winter with my Tacoma. It just washed away after a while.
This stuff never even dripped off anywhere when I applied it and after two salty seasons it has held up. It is CRC 6026. My dad bought a new Ram right before winter, crew cab. Think he used 6 cans over 2 coats of application.
I have a buddy who did an undercoating with the plasticized rubber on a new 2500 - it started flaking off after a season and there was rust under it. If there is any rust under this type of coating it just won’t stick.
Had another family member pay for line x on his STI Subaru, and that turned out to be a disaster a couple years in. Rust was present underneath the line x and it ate a hole in his frame.