Surface Preparation
Wood surface must be clean, dry and frost-free (moisture content max. 20%). Ideally, surfaces are sanded no finer than a P120 grit grade of sand paper. Sanding to finer grades will reduce required absorbency.
Osmo UV-Protection-Oil Exra is ready to use. Do not thin. Stir well using a flat stirring stick or spatula before use. If possible, and if the wood is an absorbent species, please apply the first coat to all sides before installation.
Fresh wood containing natural wood ingredients /extractives (eg: Cedar, Larch, Teak, Mahogany or Iroko) are often less absorbent and need to weather off first before applying the product. Weathering helps ingredient-rich wood become more absorbent and the wood finish adheres optimally. Weathering is also required if ingredient-rich wood has been freshly sanded or renovated.
A coloured base coat is recommended, e.g. Natural Oil Woodstain. Coloured base coats can improve UV protection.
For renovations, clean old microporous wood finishes thoroughly. De-grey any weathered bare wood with Osmo Wood Reviver Power-Gel before applying an Osmo exterior product.
Old paints and lacquers must be completely removed. As a general rule, wear a dust mask during sanding work. To maintain absorbency, avoid sanding surfaces finer than a P120 grit. Weather ingredient-rich wood after sanding.
The finished surface is influenced by several factors, including the condition of the wood. Therefore, a trial application is always required, especially for unfamiliar surfaces.
Softwood species like Pine or Spruce are more prone to blue stains, rot and insects. If desired, pre-treat these soft woods if possible on all sides with Osmo WR Base Coat.
Method of Application
With a Flat Brush or Microfibre Roller, apply thinly along the wood grain and spread well.
Allow to dry for approx. 12 hours. Cooler temperatures, higher humidity levels or over-application will delay drying. Once dry, apply the second coat thinly.
When recoating colour-treated surfaces, or for renovation works, one coat applied to the clean and dry surface is usually sufficient.
Note
Oils enhance and intensify the natural tone of wood (permanent wet effect).
Depending on the degree of weathering, apply one coat of Osmo UV-Protection-Oil Extra to the cleaned and intact finish after approx. 3-4 years.
Osmo UV-Protection-Oil is best suited to vertical structures where there is plenty of water run-off. For areas exposed to strong weathering, such as flat horizontals, weatherboard, post caps or window sills, please expect significantly shorter renovation intervals. Vertical elements mounted onto horizontal wood should have at least a 15-degree angle. Sharp edges must be rounded (radius > 2 mm).
If the greying process has already begun, de-grey the surface with Osmo Wood Reviver Power Gel and refinish the dried surface with 2 thin coats of Osmo UV-Protection-Oil Extra.
To achieve the UV protection factor 12, it is necessary to apply 2 thin coats of UV-Protection-Oil Extra. With only one coat on untreated wood, the life of the coating is significantly shorter.
Using power washers will severely decrease the coverage of the finish and general or multi-purpose cleaners will increase the frequency of maintenance and recoating.
Care
Regular Cleaning: Damp cleaning with Spray-Cleaner or diluted Decking Cleaner.
Occasional Maintenance: If necessary, intensive cleaning and refreshing using Osmo Wood Reviver Power Gel or Osmo Gard Clean.
Recoating: Simply re-apply one thin coat onto the clean and dry surface when signs of wear become visible.
