Exterior timbers turn grey or silver over time as a result of exposure to the sun and rain. Osmo UV 420 is a high quality oil that protects against the greying effect of the sun's UV rays on exterior wood by a factor of 12. It can be applied with a brush or mohair roller to a wide range of exterior soft and hard woods including pine, larch, teak, oak and bamboo. It offers superb durability against weathering with an added biocide to combat insect attack and fungal growth. Easily applied, Osmo UV Protection Oil 420 dries to a satin-matt finish that will not peel, flake or blister. Available in 750ml and 2.5L sizes.
|Application Method||Brush \ Roller|
|Clean Up||White Spirit|
|Coverage||24 m² per litre|
|Drying Time||8-10 hrs|
5 October 2017
Ok on uprights, not good on cills & horizontal beadsUsed on European oak windows. Looks great initially but after 4 or 5 months it hadn't lasted on the cills & horizontal beads. Really disappointing as we'd changed from another product to Osmo thinking it was better. Won't be using it again.
20 December 2015
Good product for external hardwoodThis product works well for hardwood that is outside, though as the product documentation says it is intended for vertical surfaces. So I would not be too surprised to see it do badly on window sills, as commented by another reviewer. At test board in a SW facing situation has after one summer weathered much better than another board (from the same piece of wood) that was treated with tung oil. 12 hours to dry would be a touch optimistic in the British climate, but other than that it is as the manufacturer describes. The natural version does leave the wood looking much more natural than tung oil. Not yet seen any sign of flaking or blistering.
20 April 2015
Goes on easily, dried quickly, looks goodUsed on exterior hard wood on boat. It was easy to use and gives a good finish.
Red barn man
16 January 2015
Disappointing performance given the priceHave used this on new oak windows - 2 coats. The finish is initially good and it has performed reasonably well on vertical surfaces but the sill and beads where water sheds less quickly have started degrading after just 6 months allowing the wood undermeath to turn black. Drying time is rarely as short as 12 hours, in cold weather it can take a couple of days. (I have also used the non-UV version and that dries more quickly). Will try again in the late spring and put on 3 or 4 coats to see if this holds up better.