Purified Linseed Oil is a natural rust inhibitor so consequently all Linseed Oil Paint colors are excellent for both interior and exterior metal applications.


For exterior metal, the Iron Oxide Minium is the ideal "primer" coat formulated with a special Spanish pigment called hematite, which creates a fish scale-like pattern on the surface that protects against material degradation. It effectively keeps moisture from deteriorating the metal over time and an excellent alternative to modern coatings that crack, peel, flake and are often very toxic.


Any Ottosson Linseed Oil Paint color can be applied as a top-coat.



- A breathable coating that preserves metal and does not trap moisture.

- Does not fail (i.e. crack and peel) like many modern metal coating products.

- Easy maintenance. 

- Non-toxic. Safe to work with, live with, and safe for the environment.

- Long tradition before power-coating and other petrochemical-based metal coating products.

Application suggestions:


Remove as must rust with a wire brush as possible. Clean surface if needed to remove dust, dirt, organic growth, rinse well, and let dry fully. Sandblasting to remove old coatings is a possible way to prep a surface, like old radiators for example, before painting with Linseed Oil Paint for a very smooth finish.


Surface does not need to be 100% rust free before application.


Apply 1-2 thin even coats of Iron Oxide Minimum on clean, dry exterior metal surfaces. Iron Oxide Minium “primer” is not necessary for interior metal surfaces.


Finish with 2 coats of your final top coat color. See the Ottosson color palette below.


Best when applied to a bare metal surface but can be applied on-top of a previous coating. Be aware if the old coating underneath the Linseed Oil Paint is failing or fails in the future, it will of course take the Linseed Oil Paint with it when it peels, cracks, etc.


3 coats is ideal for long-lasting protection. Do not mix with petrochemical products or use with conventional linseed oil.


Wipe on Linseed Oil Paint with a clean cloth or use a stiff bristle brush.


Maintain by cleaning surfaces with Linseed Oil Soap or a non-petrochemical liquid soap, rinse well, let dry, before application of a maintenance coat of Purified Linseed Oil or a coat of your preferred Linseed Oil Paint top-coat color.


Let dry fully between coats.

Note: Can be sprayed with an airless sprayer but a significant portion of the product is lost as soon as it becomes airborne. This is not the most economical way to apply Linseed Oil Paint and is significantly more difficult to achieve thin, even coats.

Clean-up with Linseed Oil Soap. No solvents required.

Step 1 - Clean and Prep Surface

Step 2 - Apply Iron Oxide Minium

Step 3 - Apply Second Coat of Top-Coat Color

Step 4 - Apply Final Coat of Top-Coat Color


Ottosson Linseed Oil Paint

- Architectural Features - Fencing - Automobile Undercoating - Bridges -

Protect and preserve metal surfaces with time-tested, breathable coatings.

Specialty Metal Applications 



Ottosson Graphite, the same graphite used in your reliable No. 2 pencil, is a very traditional coating for demanding exterior metal surfaces, such as roofs, gutters, farming equipment, etc.

For such applications, apply Graphite as a top-coat after the

Iron Oxide Minium "primer."

It can also be used as a stove-blacking for metal exposed to high-heat such as cast iron stoves for example. Do not apply primer. Apply Graphite directly onto metal and let fully dry before exposing to heat.

Other pigments will not hold-up in high temperatures. 

Note: Graphite should not be applied on high-traffic areas or surfaces that will be touched or sat upon as it can easily leave marks or rub off.

It is not a typical Linseed Oil Paint and meant only for specialty applications.