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I recently varnished an hardwood frame for a mirror with a water based urethane varnish. My painter's tape did protect most of the mirror's edges, but it failed for one or two spots. The varnish found it's way under the tape. I want to get rid of the spots without scratching my mirror. I tried to use soap and water as suggested on my varnish's label, but that's clearly for when the varnish is not dry. So, I'm wondering what's a good way to remove dry varnish from a mirror. Obviously, my top priority is not to scratch the mirror itself.

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The chance of scratching glass with a razor scraper is slim to none. –  Comintern Mar 22 at 18:24
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nice sharp single sided razor blade in a handle works great. –  shirlock homes Mar 22 at 19:09
    
Yup a single edge razor blade does the trick. What scratches the glass is when the blade gets dull or grit on the surface of the glass gets caught with the blade. –  Jack Mar 22 at 21:51
    
@Comintern Thanks everyone, I've used a razor blade with a handle and it worked great. I have no more varnish spots on my mirror! –  Maxime Morin Mar 24 at 0:51
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1 Answer 1

up vote 3 down vote accepted

Razor scrapper would work best with a little mineral spirits.

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I actually didn't have to use mineral spirits. –  Maxime Morin Mar 24 at 0:52
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