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Dan, I think that first photo is a combination of corrosion from the engine sitting (note it's on the exhaust side where water accumulates) and glass bead. I used to run a soda blasting business (in Michigan, as a matter of fact) and the basic Armex isn't aggressive enough to do that unless the substrate is weak (as it certainly was, being made of aluminum oxide. . .)
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
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