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Expert's Corner — n-methyl-pyrrolidone

TIP: Dry Off NMP Residue

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Paint and varnish removers sold in plastic containers contain the solvent n-methyl pyrrolidone (NMP) as the active ingredient. This solvent is relatively expensive, so manufacturers often mix in other solvents to reduce the cost. But it’s the NMP that does the majority of the work. NMP has less solvent strength than the methylene chloride and the other solvents used in strippers sold in cans. Just the packaging, plastic vs. metal, tells you this. The reason NMP is still effective is that it evaporates extremely slowly, so it can remain wet on the paint or finish for days if necessary. I...

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TIP: Alchohol and Lacquer Thinner for Stripping

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TIP: Alchohol and Lacquer Thinner for Stripping

Alcohol dissolves shellac, and lacquer thinner dissolves lacquer. So you can use these solvents instead of paint-and-varnish remover for stripping. The advantage is that you don’t have to then remove the wax residue or dry off the lingering n-methyl-pyrrolidone solvent. The disadvantage is that it’s more difficult to strip complex three-dimensional surfaces. But alcohol and lacquer thinner are easy to use on flat surfaces such as tabletops. Simply wet some rags or paper towels with the solvent and lay them on the surface. Keep them wet by pouring on more solvent until the finish has liquefied and you can wipe...

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