Applying A Primer Coat - Exterior Linseed Paint


1. Prepare Surface:

The first step is to prepare the surface. Like any surface this needs to be clean, dry and free of dust.
Sand down the surface with sandpaper, ideally 120 grit. For the most long-lasting results remove
all previous paint.

2. Apply Knotting Primer:

If there are any knots these need to be treated with shellac knotting primer, especially on new
timber where there is usually more sap. This will seal the knot. When doing this use a cheap brush
as the brush will go hard when you have finished. You can use it over and over again with the
shellac knotting primer but you can’t clean it for painting with after use with the knotting primer.
Apply two coats of knotting primer and allow 30 minutes between coats for drying.

3. Mix Primer Coat:

Mix linseed oil paint, raw linseed oil and balsam turpentine in the following ratios:
50% linseed oil paint, 35% raw linseed oil and 15% balsam turpentine.
Measurements do not have to be exact but the paint must be nice and thin for the first application.
Give this mixture a really good stir before applying.

4. Applying the Primer:

The mixture is very thin and we are not trying to get an even coverage of colour with this coat,
just for the oil and pigment to be absorbed into the wood.
Use long brush strokes to gently work the paint into the timber.
The area will be very patchy when finished, with some areas being very matt and others having more of a sheen.
The matt areas are where the oil has soaked into the wood, the more glossy where it is sitting on the surface.
You can apply your next coat of linseed oil paint straight from the tin when the surface is dry to the touch.
This will vary according to the conditions and how thickly the paint is applied but we would say allow 24 hours between coats.
A final coat of linseed oil paint should be sufficient to give you an excellent finish. Always apply linseed oil paint in thin coats.



You can use Exterior Linseed Oil Paint on interior wood work (e.g. doors, skirting, window and door frames, flooring, staircases).
You don't need to prepare a priming coat when using Exterior Paint indoors.
Just apply the paint in thin coats straight from the tin - two coats should be enough.
Drying times may be longer indoors as there is less UV light.



Make sure the surface is clean and dry with no flaking rust. Use a wire brush
to prepare the surface if necessary.
Apply two coats of Linseed Oil Iron Oxide Metal Primer on untreated or
unprimed metal before finishing off with two coats of linseed oil paint in a colour of your choice.



Depending on absorption levels, softer stone, brick and masonry might require a primer coat of 50% paint : 50% raw linseed oil to make the paint easier to brush on an absorbing substrate. UPVC does not require a primer. For UPVC, simply make sure the surface is clean and dry before applying the linseed oil paint. Most surfaces will require two coats of linseed oil paint to achieve a good finish.


Download the instructions here: