Osmo UV Protection Oil Extra (420 Clear)

SKU id3421 Non Hazardous
Micro-porous protection against UV, mildew, algae and fungal attack on exterior oak or cladding.
Available in 0.75 and 2.5 Litres
£18.18 (£21.82 Inc VAT)
£18.18 (£21.82 Inc VAT)

Product Description

Osmo UV Protection Oil Extra (420 Clear) enhances the natural character of the wood while providing a satin finish that does not crack, peel or blister. Contains biocides to protect against algae, mildew and fungal attack.

Osmo UV Protection Oil Extra (420 Clear) provides a microporous surface allows the wood to breathe and reduces swelling and shrinkage. Osmo UV Protection Oil 420 provides a surface coating rather than a oil finish. If you require an oil finish, please look at the Osmo UV Protection Oil 410.

Water-repellent, does not crack, peel or flake. Simply apply without sanding. Easy and seamless application. Finish stays workable while coating. As top coat on already coloured treated wood,Osmo UV Protection Oil Extra (420 Clear) extends intervals between renovations significantly. As self-priming finish, it prevents the greying process on vertical surfaces with a UV protection factor 12 in comparison to untreated wood when two coats are applied.

Best Uses

Osmo UV Protection Oil Extra (420 Clear) is ideal for all exterior vertical wood surfaces: doors, windows, window shutters (dimensionally stable elements), carports, timber cladding, balconies, fences, pergolas, and summer houses (dimensionally unstable elements).

  • Incredibly water and dirt resistant
  • Reduces wood swelling and shrinkage
  • 420 contains biocides to prevent the growth of algae, mildew and fungal attack
  • Microporous, breathable finish which does not crack, peel, flake or blister
  • No sanding necessary for future applications


Wood surface must be clean, dry and frost-free (moisture content max. 20%). Osmo UV Protection Oil Extra (420 Clear) is ready to use, please do not thin. Stir well before use. Clean old microporous stains thoroughly. Old paints and lacquers must be completely removed. As a general rule, wear a dust mask during sanding works. Do not sand smooth surfaces finer than P120. If possible, please apply base coat to all sides before installation. Fresh wood, containing natural wood extractives and especially hard wood needs to weather off (for approximately 6 weeks) after installation. Thereby the wood becomes absorbent and the wood finish adheres optimally.

A base coat with a coloured finish is recommended, e.g. Osmo One Coat Only HS Plus, Osmo Natural Oil Woodstain or Osmo Country Colour. For renovations, clean old microporous wood finishes thoroughly. Already greyed or weathered wood should be refreshed and cleaned with Osmo Wood Reviver Power-Gel. The finished surface is, among other things, influenced by the wood‘s natural characteristics. Therefore, a trial application is always required, especially for unfamiliar surfaces. If additional protection against blue stain, rot and insects is desired, pre-treat the wood if possible on all sides with Osmo WR Base Coat. Use biocides safely. Always read label and product information before use.

Recommended Products To Use

Osmo WR Base Coat (4001 Clear)

Osmo WR Base Coat (4001 Clear)

A clear solvent based exterior wood protector stops animal, wood pests, rot, blue stain and insect attack.

£38.27 (£45.92 Inc VAT)
Osmo Wood Reviver Power Gel 6609, 2.5 Litres

Osmo Wood Reviver Power Gel 6609, 2.5 Litres

A powerful clear, high viscosity gel for refreshing and renovating external greying wood.

£30.88 (£37.06 Inc VAT)
Osmo UV Protection Oil (410 Clear)

Osmo UV Protection Oil (410 Clear)

Enhances the natural character of the wood without greying. Supports a healthy living environment without the use of bioci...

£53.00 (£63.60 Inc VAT)