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Blotchy Mirror Coatings - Bob May Are You There?

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Posted by Bob Bennett on October 2, 2000 15:54:05 UTC

I posted this question on the General Forum, and Kip suggested i repost here. Evidently Mr. Bob May is the mirror guru...

Here is my problem...
I recently painted the inside of my old 10-inch Starfinder`s OTA with Krylon Ultra-flat black, as the factory finish is somewhat shiny. I then washed the primary mirror before restoring it to the OTA.

Two weeks later, ie yesterday, I removed the mirror again (not satisfied with the Krylon paint job) and find that the reflective coating appears very blotchy. As in `Yuk!!`.

I can not believe it will work optimally looking like this.

Two newbie questions

1) is the blotching maybe caused by outgassed fumes from the paint job?

2) are Starfinder mirrors worth having recoated? (i tried several ronchi tests and got near-perfect results, so maybe this is a good one)

thanks in advance for any help


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