Ideal for restoring wooden surfaces greyed through time and weathering. This is a powerful cleaning agent for the refreshing and cleaning of weathered exterior wood. The high energy UV rays from the sun destroy the lignin in wood causing the wood to turn grey over time. Osmo Wood Reviver Power Gel has been specially developed to restore the wood back to its original colour and character. Easy to apply with a brush, even on vertical structures thanks to the non-drip formula. The deep penetrating effect of the gel is most effective on untreated surfaces with results showing within just 30 minutes. .