So tonight I was cleaning up a bunch of aluminum parts in my media blast cabinet. I was using an extremely fine glass bead with a mesh size of 140-230. It is so fine it feels like talcum powder. It almost polishes aluminum.
I saw my extremely faded light blue lockout knobs sitting on the counter and decided to put them in and give them a shot. I had already rinsed them in a parts washer and then scrubbed them with a toothbrush and some Spray9 followed by a couple of rinses with water so they were perfectly clean but almost chalky white.
I turned the air pressure down to about 60psi'max. The knobs came out looking like this. It appears to have "burnished" away the old faded and weathered top layer of the plastic.
I'm tempted to take the can of Krylon Fusion paint back to the store and run them like this. I wonder if they will last ...
I really wish I had a before picture to show what they looked like originally but they had 40 years of Arizona Sun fade. Here is what they look like now.
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