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I have a table that I want to add another clear-coat layer to (to smooth and level without sanding). It's already stained and sealed, so I want to choose a clear-coat (polyurethane, lacquer, epoxy) that will bind with what was used on it before, but I don't know what was used before.

What's the best way to determine what kind of finish is on this table, so that additional coats will stick properly?

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    FYI, the coating on furniture isn't usually called "sealant". "Varnish" or simply the "finish" are more common. – isherwood Apr 2 '18 at 14:13
  • The instructions on most finishes normally call for a scuff sanding before an additional coat, so I don't think you're going to get away without sanding completely. – JPhi1618 Apr 2 '18 at 15:43

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