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Originally Posted by Centerline
OK, the technical term is etching filler (I changed my original post to reflect that fact). Its Martin Senour Chromate Free Etching Filler Part # 15211 with 15212 hardener. It's a two part etching filler that Martin Senour recommends for bare metal, fiberglass, galvanized steel, cured body filler, aluminum, OEM enamels, and OEM lacquers. I like everything about it except the ugly green color. 
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Guess I am wrong, does look like etch. Must admit not familar with nor have used any Martin senour products. Sorry.
And weird, the PDS says can be directly topcoat, not often you see that. I am guessing the 15212 is really an acid/reducer, not an activator?