tried hard anodizing?

[tloc54452]

Has anyone tried hard anodizing?  I used to use tefloned hard anodizing 
on 6061 for mechanical parts subject to sliding.  It has a duller, 
grayer finish.  I wonder how it does in the weather.  I have regular 
anodizing, water sealed, on my 12" (30 cm) bowstring equatorial.  Fine 
weather resistance, but...  The equatorial surface is really a concave 
cylindrical mirror, so it's pretty darn bright to the eye from some 
norrmal viewing positions.  Hard anodizing might be the cure.  Anyone 
tried it?

For those unfamiliar with hard anodizing, but curious, googling found:
http://www.techplate.com/hard_anodize.htm
Thanks,
John B
---------------------------------------------------
https://lists.uni-koeln.de/mailman/listinfo/sundial