I got a case of that stuff for around $100 right after I graduated high school in 2004.
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Packaged in brown paper, 30 rounds per packet and on stripper clips. When I opened up the 550 rd tin made a hiss that would get that Stevemre1989 guy on YouTube tingley. And the green paint from the inside of the spam can was still tacky. Should of bought the other two cases the guy had. But money was hard to come by for then 18 year old me. My Mak90 absolutely loves the stuff so I ration it.
And yes it is very corrosive. If you are one of those AK guys that never clean your AK, and you shoot that stuff and throw your AK in the closet afterwards and forget about for a couple months. You might the assistance of WD40 and a rubber mallet.