If you are after a gloss black finish that sticks like the proverbial s... to a blanket, and in a one step process try this stuff.
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I get it from my local metal dealer for $9.50 for a 400gram can. It is also available in silver that has a near chrome like finish when sprayed over smooth metal. It is my go to stuff for treating welds and making old metal look like I spent a lot of time prepping it.