Thanks tomheart and welcome to the forum.
Thank you for the heads up. I could only use it if it didn't push the production price out to the stratosphere.If you want a flat black anodized like surface I recommend you use CHEMGLAZE Z306. This is the only product recommended for optics in space applications. I'm sure it works the same here on the ground.
The parts that will be anodized are external like the stand clamp and focus ring, so will not affect light performance through the lens.. In reading through this thread you mentioned anodizing some of your lens parts.