Fernissa

Linseed Varnish Oil

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

Available in 5 litre and 1 litre containers. Retailers

LINSEED VARNISH OIL is our thickest oil, and the quickest-drying. It is extracted from linseed oil using our unique refining process, consisting of 100% unsaturated (i.e., drying) linseed-oil fatty acids made non-biodegradable by pre-polymerisation, giving the oil the desired viscosity and drying time. LINSEED VARNISH OIL dries into the polymer linoxyn (which permanently attaches to wood and resists microbes, insects, fats, petroleum products, salts and acids regularly found in the household, e.g. lemon, wine and vinegar). At 20°C / 60°F and with good ventilation, LINSEED VARNISH OIL dries in 6-24 hours. Read more on this here: TECHNOLOGY.

LINSEED VARNISH OIL creates gorgeous 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 polishing cloth.

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

Both oils make wood rot-resistent by making it waterproof - rot fungi cannot live in dry wood, and additionally, no organisms can extract nourishment from these oils.

Download the Product Data Sheet (.PDF format) here: LINSEED VARNISH OIL

Video: cutting boards after two treatments by Skogshults Snickeri woodshop: FURNITURE OIL impregnation and LINSEED VARNISH OIL polishing.

WORK MANUAL

Oil-polishing
Polish clean and dry wood surfaces that have been previously (the day before at the latest) impregnated with PRIMER OIL or FURNITURE OIL. Use an abrasive pad, polishing pad or cloth wetted with LINSEED VARNISH OIL. Make sure the sheet, pad or cloth is kept moist. Work the surface until an even sheen is achieved.

Give time to oxidate until the surface is dry. This usually takes one day.
Keep in mind that if a large surface, e.g. a floor, is at room temperature or warmer, the LINSEED VARNISH OIL will dry before you’re done working. Polish those kinds of surfaces with FLOOR OIL.

Note: when polishing a porch, use a #100-or-less abrasive pad - a finer pad will make the surface slippery when wet.

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 (like STRONG SOFT SOAP), as the oil reacts with basics and the outer layer dissolves, and the surface has to re-polished.

Oil-impregnation guide

Oil-impregnate thoroughly dry pressure-impregnated wood. Heat LINSEED VARNISH OIL to 130⁰C / 266⁰F in a deep-frier. Apply plenty of oil with a natural-bristle brush. Spread from saturated areas to areas still absorbing oil. Apply and spread until the entire surface is saturated.

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, low-viscosity LINSEED VARNISH OIL penetrates. Little steam bubbles on the oil surface are sometimes visible when applying warm LINSEED VARNISH OIL.

You can safely work with 130°C / 266°F LINSEED VARNISH OIL - it will neither burn nor fume. It’s poorly heat-conducting, so you can dip your fingertips in it or wipe your brush against your hand with no risk of burns. Its boiling point is 300°C / 572°F, and it will start to exude a white, sharply smelling steam from its surface at 180°C / 356°F. At 130°C / 266°F, it will only produce a faint smell of linseed oil.

After 20-30 minutes, remove the excess LINSEED VARNISH OIL left on the surface. Leftover LINSEED VARNISH OIL leaves a sticky skin. This can be removed by gently scraping off the skin using a card scraper and then machine-polishing with LINSEED VARNISH OIL or FLOOR OIL.

Give time to oxidate for at least 24 hours.

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

WORKER SAFETY

No respiratory protection necessary. Provide good ventilation. The oil is a poor heat conductor and does not cause burns if spilled, but be aware that metal objects that have been in warm oil burns.

WARNING: DANGER OF SPONTANEOUS COMBUSTION!

Cloths and other porous materials moistened with linseed oil must be soaked in water before disposal. Oil-treated surfaces do not ignite on their own. The danger concerns only fibrous materials.