Painting Instructions for Linseed Oil Paint

Linseed Oil Paint is a traditional oil paint for exterior surfaces. The genuine Uula Linseed Oil Paint is made the traditional way with pressed and boiled linseed oil and colour pigments. Boiled linseed oil as the main ingredient and binder in the paint provides a vapour permeable surface that allows the wood to breathe. Water naturally evaporates through the paint, ensuring no moisture is trapped underneath that might cause the paint to peel off or the wood to decay. The paint dries slowly, which ensures thorough absorption and adhesion.



PAINTING INSTRUCTIONS

The paint must always be stirred well before and during use. Reserve enough paint for large surfaces to avoid potential tonal variation in different batches. Check the colour before painting. Test the paint on a separate piece of wood and wait for the paint to dry for true colour. It is characteristic of oil paints to develop a yellowish tone over time in dark conditions. The paint must be applied thinly applying some pressure. Too thick a coat may wrinkle when drying. Warming the paint slightly prior to painting helps apply it thinly. For a smooth and even toned finish, paint a whole board at a time from top to bottom in vertical weatherboarding, or side to side in horizontal boarding, starting at the top of the wall. Also paint open ends of timber carefully to avoid cracking and splitting of boards.

Application and conditions

The surface must be dry and the moisture content of the wood below 15%. The relative air humidity should be below 80% and the air temperature at least +10°C. Drying time at +20°C and <80% relative humidity: touch dry in 2–3 days, depending on the circumstances. A new coat can be applied four days later at the earliest. Warmth and light is required for the paint to dry (min +10°C). Do not paint in the rain, in direct sunlight or on sun heated surfaces. Apply using a relatively stiff, high-quality paint brush or levelling paint brush. If the paint is sprayed on the surface, spread the paint with a brush after spraying. The paint should be thinned 10% with Uula Oil Paint Thinner if sprayed on the surface.


Preparation & Priming & Finishing

Remove peeling and flaky old paint with a wire brush and scraper. Remove old paint as thoroughly as possible. Old, thick paint layers can be removed efficiently using Uula Paint Remover. Wash dirty surfaces with Uula Paint Washing Agent and mouldy ones with Uula Mould Cleaning Agent. Sand new planed surfaces rough to ensure adhesion. If painting is postponed to the following summer, protect the surface with Uula Anti-Mould Agent.


Priming

Previously painted exterior wood surfaces: Prime bare patches of wood with Uula Exterior Primer and treat the entire surface with Uula Anti-Mould Agent. Prime metal surfaces with anti-rust primer before painting.

New exterior wood surfaces: Prime new exterior surfaces with Uula Exterior Primer. New, industrially primed wood surfaces do not need priming with Uula Exterior Primer or treating with Uula Anti-Mould Agent. If the surface is new planed timber, sand the surface rough to ensure adhesion or alternatively, protect the surface with Uula Anti-Mould Agent and let the wood age for 1-2 years before painting.


First coat

Paint the primed exterior surfaces with Uula Linseed Oil Paint thinned 10–15% with Uula Oil Paint Thinner. Paint a thin layer in pressured strokes following the grain of the wood. If applied too thick, the paint may wrinkle as it dries. For a smooth and even toned finish, paint a whole board at a time from top to bottom with vertical weatherboarding, or side to side with horizontal boarding, starting at the top of the wall. Also paint open ends of timber carefully to avoid cracking and splitting of boards. Allow to dry for at least 4 days before applying the second coat.

Finishing

Before painting the second coat, make sure the paint has dried properly. Brush off any dust and dirt. If necessary, thin the paint 10% maximum (e.g. in cool conditions). Paint thinly applying some pressure. Warming the paint slightly prior to painting helps apply it thinly. Prime exterior metal surfaces with anti-rust paint, otherwise follow the instructions above.


Additional information

Coverage: Planed timber 10–15 m2/l, rough sawn timber 8–12 m2/l.
Thinner: On exterior surfaces thin with Uula Oil Paint Thinner.
Cleaning of equipment: Clean the equipment with Uula Universal Thinner or petroleum spirit and rinse with soap
and water.
Storage and disposal: Keep in a cool and dry place. Keep out of reach of children. Does not freeze. Always stir well before use as the pigment settles during storage. Dry and empty containers can be recycled. Liquid waste must be taken to a municipal hazardous waste collection point.
Caution: Linseed oil on cleaning cloths etc. may spontaneously combust. Oily rags and cloths should be burned or rinsed with water before putting in a rubbish bin.

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