By the way... i used a stationary black matte self adesive product not the one that is used in telescopes, but i think it will work, if i cannot make or get a paint that i really see that itīs an improvement over the regular matte black paint i will use this adesive to improve the internal flare in my LF lensboards and in my laborator 1000, itīs cheap and easy... although i really would like to get a paint that would became a sandpaper really matte surface!