Which Wood Finish Should You Use? | 13

Marc and Matt spend much of this episode sorting through one of woodworking’s most confusing subjects: choosing a finish.

Marc starts by explaining the difference between evaporative finishes, such as lacquer and shellac, and reactive finishes, such as oil-based varnish and catalyzed lacquer. Evaporative finishes are generally easier to repair because a new coat or the proper solvent can soften and blend with the existing finish. Reactive finishes tend to offer more protection, but each coat cures as a separate layer and repairs can be more difficult.

They also break down several common finish types:

Oils, such as linseed oil and tung oil, soak into the wood rather than building much of a protective film. They are easy to apply and bring out the depth and color of the wood, but offer limited protection and often need to be renewed over time.

Varnishes, including polyurethane, provide much better resistance to scratches, heat, and solvents. They can be brushed, wiped, or sprayed, but some woodworkers dislike the heavier film or “plastic” look that can come with certain products.

Oil/varnish blends offer a middle ground. They are easy to wipe on like an oil but provide more protection as additional coats build. Marc recommends them as a good place for newer woodworkers to start, though they generally require more coats and drying time than straight varnish.

The show also includes a follow-up to a question about hand-plane blades: the steel Matt was trying to remember is O1 steel.

Marc and Nicole will be at the Festool booth during the AWFS show in Las Vegas, and Matt mentions the “Win a Weekend with Norm” sweepstakes and the Podcast Awards at PodcastAwards.com.

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