IMHO, if you put a clear on a single stage (not needed)you will loose most of the benefits of using a single stage, ie, Distinctness of image. It's sort of like a front surface mirror versus a standard mirror. A front surface mirror has the reflective surface on the front of the mirror. A traditional mirror has the reflective surface on the back side of the mirror. A front surface mirror reflects the light back immediately and very distinctly without much distortion. In a traditional back surface mirror the light has to go through the glass to hit the reflective surface, then back out through the glass which tends to diffuse the light a tiny bit. If you don't have decals or graphics that need a clear coat I personally would just buff the single stage.
All of the good reflective telescopes use front surface mirrors only.
just my 2 cents.
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