Grundolja

Primer Oil

A drying oil which makes wood water-repellent, resistant to rot, dimensionally stable and which increases its bending strength.

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

PRIMER OIL 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.
Read more on the TECHNOLOGY.

PRIMER OIL makes wood rot resistant by making it waterproof - fungi cannot grow in dry wood, and no organism can extract nourishment from the oil.

Field tests and tests in a rotting chamber show that wood deep impregnated with PRIMER OIL remains free of rot for a minimum of 24 years - in moist soil!

The dimensional stability and the increased bending strength - doubled in our experiments - is a result of the wood forming a natural composite with linoxyn.

Sunlight will make the surface turn grey. The original colour of the wood can easily be restored by rubbing a small quantity of PRIMER OIL into the surface.

Wood treated with PRIMER OIL can be glued, polished with LINSEED VARNISH OIL and/or painted. For optimal results, paint with Selder & Co’s linseed oil paints.

Download the Technical Data Sheet in PDF format here: PRIMER OIL

Video: Skoghults Snickeri joinery applying hot refined linseed oil

Video: Carpenter Martin Lydén deep-impregnating wood in a deep fryer.

WORK MANUAL

Wood can be protected with PRIMER OIL in different ways. The most basic treatment gives surface protection. With the more demanding methods, the oil penetrates deeper into the wood.

Using the Selder method in an autoclave - a pressure vessel - even whitewood of thick dimensions can be impregnated all the way to the core. Ask us about details.

NOTE: It is difficult to achieve an oil polished surface on beech and birch. These species of wood absorb a lot of oil and you must oil impregnate at least twice before the surface is sufficiently sealed for oil polishing. In addition, the colour of the oil treated wood varies and the surface becomes mottled. This applies especially to boards of glued lamellas, the surface of which consists of different grains.

Treatment with oil at room temperature

Apply PRIMER OIL liberally with a brush on dry wood. Spread from places that are saturated to places that still absorb oil. Apply and spread until the entire surface is saturated.
The oil penetrates a few tenths of a millimetre, i.e., 1-5/250”, into sound wood.
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 1-2 hours. If you want to remove such skin, carefully scrape it off with a sickle and machine polish with PRIMER OIL.
Wash brushes, tools and utensils with strong soap, such as STRONG SOFT SOAP.
Allow time to oxidize for at least 24 hours.

Impregnation with a brush

Heat PRIMER 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 up to 1,5 mm, i.e., 0,06", into sound wood.
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 PRIMER OIL.
Wash brushes, tools and utensils with strong soap, such as STRONG SOFT SOAP.
Allow time to oxidize for at least 24 hours. Use our thicker LINSEED VARNISH OIL for pressure impregnated wood.
By heating the surface with a hot air blower or an IR heater while working, you can achieve penetration of 2-3 mm, i.e., 0,08-0,12".

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

You can safely work with PRIMER 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 exude a white, sharply smelling steam at 180 °C / 356 °F. At 130 °C / 266 °F, it will only emit a smell of linseed oil.

Deep impregnating end wood

Heat PRIMER OIL to 130 °C in a deep fryer. Place the workpieces vertically in the warm oil and leave them there until the bubbling of escaping steam has ceased. Turn off the heat and let them sit in the oil for another 15 minutes. Lift them up and let them cool.
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 1-2 hours. If you want to remove such skin, carefully scrape it off with a sickle and machine polish with PRIMER OIL.
Wash brushes, tools and utensils with strong soap, such as STRONG SOFT SOAP.
Allow time to oxidize for at least 24 hours.
Video: Carpenter Martin Lydén deep impregnates end wood in a pot at the building site.

The drying time varies: The oil dries by oxidation and the time needed to dry depends on two factors: the supply of oxygen and the temperature. The oil can be dry to the touch in a few hours’ time on a windy, hot summer day, whereas it can take up to a week in a cool, poorly ventilated garage.

Gluing or painting

You can glue and paint wood impregnated with PRIMER OIL. Preferably use Selder & Co's linseed oil paints, which adhere permanently and which can be easily maintained by applying a small amount of LINSEED VARNISH OIL when the colour begins to fade after one or more decades, depending on the amount of UV exposure.

WARNINGS

DANGER OF SPONTANEOUS COMBUSTION!
Cloths and other porous materials moistened with linseed oil must be soaked in water without delay. Oil treated surfaces do not ignite on their own. The danger concerns only fibrous materials.

The oil is indigestible. It dries in the digestive tract and causes diarrhea.

Metal objects burn when lifted from warm oil.

WORKER SAFETY

Respiratory protection is not necessary. Provide good ventilation, especially when working with oil at 130 °C. The oil has low thermal conductivity and does not cause burns if spilled.

MAINTENANCE

Sunlight will make the the surface turn grey. You can restore the original colour of the wood by rubbing a small amount of PRIMER OIL into the surface.
NOTE: Do NOT clean the surface with alkaline detergents, such as STRONG SOFT SOAP. The oil reacts with alkali, causing the outer layer to dissolve. If this occurs, rub a small quantity of PRIMER OIL into the surface to restore it.

FOR DEEP-IMPREGNATION OF ENTIRE WOOD COMPONENTS - ASK US!

When you immerse, i.e., “deep fry”, wood in PRIMER OIL at 130 °C / 266 °F and continuously provide enough heat, the moisture in the wood obviously boils out much more efficiently than when just applying warm PRIMER OIL with a brush.

When all the moisture in the wood has evaporated and you lower the temperature to 90 °C / 194 °F, a vacuum occurs in the wood and oil is sucked deep into it. The process parameters depend on the amount and type of of wood, moisture content and dimensions of the wood, so feel free to contact us at atle@selder.com for recommendations regarding your deep impregnation project!