Linseed Varnish Oil

Drying linseed oil LINSEED VARNISH OIL for polishing oil treated woods and oil impregnation of pressure impregnated woods.

Available in 1 and 5 litre cans, 200 litre drums, 1000 litre IBC containers.

LINSEED VARNISH OIL is our thickest oil, and the quickest drying. It is 100 % pre-polymerized unsaturated fatty acids of linseed oil. It is non-biodegradable and water-repellent and it resists fats, petroleum products, salts and household acids, e.g., lemon, wine and vinegar. The other constituents of linseed oil do not dry and have been removed. It therefore dries, i.e., hardens, quickly and completely to linoxyn, a natural polymer. At 20 °C / 60 °F and with good ventilation, LINSEED VARNISH OIL dries in 6-24 hours. Read more on the TECHNOLOGY.

LINSEED VARNISH OIL forms fine and durable surfaces, especially on wood treated with PRIMER OIL or FURNITURE OIL. First impregnate the wood using either oil. Create the desired surface gloss on the following day - from silk matte to high gloss - by oil-polishing with LINSEED VARNISH OIL. Choose the degree of gloss by using a coarser or finer grinding pad.

Oil impregnate pressure impregnated woods using LINSEED VARNISH OIL rather than PRIMER OIL, as the pressure impregnation breaks the cell structure of the wood and makes it so porous that it absorbs practically unlimited quantities of the thinner liquid PRIMER OIL.

Download the Product Data Sheet in PDF format here: LINSEED VARNISH OIL

Video: Cutting boards after two treatments by the joinery Skogshults Snickeri: impregnation with FURNITURE OIL and polishing with LINSEED VARNISH OIL.


Oil polishing

Polish clean and dry surfaces that were previously, no later than the day before, impregnated with Selder's oil. Use an abrasive net or pad and a little LINSEED VARNISH OIL. Begin with #500 and go higher until the surface has the desired gloss. # 1000 – 2000 gives semi-gloss, #3000 – 5000 high gloss. Keep the surface moist by wetting the abrasive with the oil. Continue until the entire surface has an even gloss.
WARNING: If you polish a surface which needs to be anti-slip, such as an outdoor wooden floor or a staircase, use a max #100 abrasive lest the surface becomes slippery when wet.

Wipe dry: Remove any residue of oil and polishing dust by wiping the surface thoroughly with a dry cotton cloth.

Allow time to oxidize for at least 24 hours.

Wash abrasives, tools and utensils with strong soft soap.

Note that birch and beechwood becomes blotchy when oiled and thus a good oiled surface is difficult to achieve. This is because these woods absorb lots of oil, and the colour of the wood varies, particularly on different grains of the lamellas.

Warning: do NOT clean the surface with alkaline detergents, such as STRONG SOFT SOAP. The oil reacts with alkali, the outer layer dissolves, and the surface has to re-polished.

Oil impregnation

Heat LINSEED VARNISH OIL to 130 °C / 266 °F in a deep fryer. Apply using a natural bristle brush - synthetic brushes melt at these temperatures. Spread from places that are saturated to places that still absorb oil. Apply and spread until the entire surface is saturated.
The oil penetrates 1,5 - 3 mm, i.e., 0.06 - 0.12" into pressure impregnated wood, deeper if cracked.

Oil that remains on the surface forms a sticky skin. If you intend to paint or glue the surface, or otherwise want to avoid this, thoroughly wipe off any oil remaining on the surface after 20-30 minutes. If you want to remove such skin, carefully scrape it off with a sickle and machine polish with LINSEED VARNISH OIL.

Wash brushes, tools and utensils with strong soap, such as STRONG SOFT SOAP.

Allow time to oxidize for at least 24 hours.

When treating wood at 130 °C / 266 °F with LINSEED VARNISH OIL, moisture in the wood evaporates, bordered pits open outwards due to the vapour pressure in the cells, and the warm, thinly liquid LINSEED VARNISH OIL penetrates. You can see small steam bubbles on the surface when you apply warm LINSEED VARNISH OIL.

You can safely work with LINSEED VARNISH OIL at 130 °C / 266 °F - it will neither burn nor fume.  Its boiling point is 300 °C / 572 °F, and it will start to emit a white, sharply smelling steam at 180 °C / 356 °F. At 130 °C / 266 °F, it will only emit a smell of linseed oil.

Wash brushes and tools used with strong soft soap, e.g. STRONG SOFT SOAP.


Respiratory protection is not necessary. Provide good ventilation. The oil has low thermal conductivity, and at 130 ⁰C it doesn’t cause burns when spilled.


Cloths, shavings and other porous material that have been moistened with LINSEED VARNISH OIL must be immersed in water without delay.

LINSEED VARNISH OIL is indigestible. It dries in the digestive tract and causes diarrhea.

Metal objects burn when lifted from warm oil.