Ronseal shed and fence preserver has been specially formulated to give colour and protection to sheds and fences the deep penetrating 2 in 1 formula eradicates woodworm whilst preserving the wood to prevent rot and decay the unique formula contains added water repellents waterproofing the timber from the damage caused by water ingress before you start ensure all surfaces are clean dry and free from surface coatings such as paint varnish or stain etc where timbers are suffering from decay before