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 '14 at 18:24
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    nice sharp single sided razor blade in a handle works great. – shirlock homes Mar 22 '14 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 '14 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 '14 at 0:51

Razor scrapper would work best with a little mineral spirits.

  • I actually didn't have to use mineral spirits. – Maxime Morin Mar 24 '14 at 0:52

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