The pressure treatment protects against rot and decay, however we do always recommend further treatment. Applying a water repellent to work alongside the pressure treatment will carry a range of benefits. Reduced swelling and shrinking – Natural timber is always looking to acquire equilibrium between the moisture in the air and the moisture within the timber itself. Left un-treated the timber will be susceptible to rapidly absorbing or expelling water. A water repellent will help to regulate this process and avoid excessive movement, cracking and splitting from occurring. Barrier – A water repellent will provide a barrier to the surface of the timber which will help prevent stains from drink spills. It will also make for an easier surface to clean down. Quick drying – Water will simply run off the timber making it usable within minutes of a downpour.