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Woodworking Math

Danish oil vs boiled linseed oil

Watco Danish Oil goes on in one session, wet-on-wet, and is ready for use in 8–10 hours. Finico’s linseed oil is wiped off after 15–20 minutes, then needs 12 hours before the second coat and 24 before each one after, and 2 days before use.

Watco prints 220–300 sq ft per gallon and says not to thin; Finico prints 120–230 sq ft per litre (about 450–870 per gallon) and thins with 30 % oil thinner. Finico warns that oily rags can catch fire by themselves: soak them in water or lay them flat to dry.

Side by side

Danish oil and Boiled linseed oil, by their makers' own sheets
PropertyDanish oilBoiled linseed oil
Touch-dryNot printed by the maker we readNot printed by the makers we read
RecoatNot printed by the maker we readFinico Linseed Oil: 12–24 h
Ready for useWatco Danish Oil: 8–10 h (ready for use)Finico Linseed Oil: 48 h (use (first damp cleaning after 14 days))
Full cureNot printed by the maker we readNot printed by the makers we read
CoverageWatco Danish Oil: 220–300 sq ft per gallonFinico Linseed Oil: 120–230 sq ft per litre
ThinningWatco Danish Oil: Do not thinFinico Linseed Oil: Dilute with 30 % oil thinnerSunnyside Boiled Linseed Oil: Up to 2:1 with mineral spirits
Makers say it is forNot printed by the maker we readNot printed by the makers we read
Makers say not forNot printed by the maker we readNot printed by the makers we read

The products behind it

Each row is its maker's own figure at the conditions it states
ProductTouch-dryRecoatUseFull cureCoverageThinning and notes
Watco Danish Oil

One source: Rust-Oleum (Watco), the maker of that product

——let it soak in 30 minutes, reapply and wait 15 more, then wipe completely dry8–10 hready for use—220–300 sq ft per gallonThinning: Do not thin.Conditions: Apply at 60–90 °F, RH under 85 %.Wait 72 hours before a polyurethane topcoat; natural drying oils and rosin ester.
Finico Linseed Oil

One source: Finico (Tembi), the maker of that product

—12–24 hwipe off the excess after 15–20 minutes48 huse (first damp cleaning after 14 days)—120–230 sq ft per litreThinning: Dilute with 30 % oil thinner.First coat 12 hours, later coats 24 hours. Rags can catch fire by themselves: soak them in water or lay them flat to dry.
Sunnyside Boiled Linseed Oil

One source: Sunnyside Corporation, the maker of that product

—————Thinning: Up to 2:1 with mineral spirits.Flax oil with additives to shorten its drying time; the sheet gives no dry times.

Work it out for your project

Times are the makers' own at the temperature and humidity they name, and several of them say cooler, damper conditions slow their finishes. For how much to buy, the finish coverage calculator uses these same coverage figures. Every finish side by side: the finish dry time chart. What the federal rules say about finishes and food: food-contact finishes.

Elsewhere in finishing: shellac and the shellac cut calculator; for repairs before the finish, wood filler vs wood putty; and for the glue-up, wood glue types.

Sources

  1. Rust-Oleum (Watco), Watco Danish Oil technical data sheet (Canada), Rev. 060113, distributor-hosted copy, read 2026-11-07.
  2. Finico (Tembi), Linseed Oil technical data sheet (dealer-hosted copy), read 2026-11-07.
  3. Sunnyside Corporation, Boiled Linseed Oil data sheet 87232S, read 2026-11-07.
  4. US Food and Drug Administration, 21 CFR 175.300, Resinous and polymeric coatings (text via Cornell Law School LII), read 2026-11-07.

How the tags work: How we source every number.