Excellent for timber sheds,
This review is from: Cuprinol 5L Ducksback 5 Year Waterproof for Sheds and Fences - Harvest Brown (DIY & Tools)
My shed is about 12 years old and has been coated several times over the years with Cuprinol wood preservative, which worked well but needed redoing every year or two and was unpleasant to use because of the white spirit fumes and the tendency of the thin fluid to run and splash everywhere. Not so the Ducksback!
So this product was bought as an easier and longer-term solution. It is really excellent. It is more of a paint than a stain but the woody texture is not lost and the finish is pleasantly matt. I was concerned the colour might be too light when I opened the tin and started work, but it darkens nicely as it dries. The previous use of traditional preservative did not impede the adhesion at all, nor did the previous use of fillers.
It needed little mixing and was a of thickish paint-like consistency that was easy to apply with hardly any running to waste. There was hardly any odour and the brush could be cleaned in water. Can't yet say if it will last 5 years but the surface feels very durable and looks smart.