Works great with sufficient preparation
I used this product to blacken the back of a lens barrel .Following the instructions is very important. Insufficient cleaning is usually the cause of poor results.
The original, black-anodized lens assembly had been scratched by an incorrect back lens cap, exposing the white metal. It looked bad, aesthetically, and was a potential source of light flares.
I first cleaned the damaged are with a strong detergent (Formula 409 on a cotton bud), then swabbed with water, then cleaned with isopropyl alcohol; the alcohol removed the black Sharpie used to hide some of the damage (a common trick among camera repairers). I then abraded the area with a grey Scotchbrite pad, then cleaned again with alcohol (as per the instructions).
I swabbed a tiny amount of the Aluminum Black with a cotton bud onto the damaged area, and continued to do so a few times within a 3-minute period. After that time the damaged area was black again. Swabbing with water and drying with a cotton bud finished the job.
This repair method was reasonably fast (less then 10 minutes from start to finish) and did not require lens disassembly.
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