Funny you should ask....so I purchased the Rust Veto 342 and my buddy purchased the Rust Veto 344 for our undercarriages. My informal comparison between the two Cosmoline products: Both come in the form of a thick liquid that could be sprayed. My buddy was a little concerned that it was too...
There is military grade Cosmoline (stuff used back in WWII) that can be sprayed, without heating. And it's the thick amber wax like form that they used on transporting cars overseas and the military still uses it today to transport their heavy equipment overseas. It's called Cosmoline...