I had a large fence installed about 18 months ago and had planned to treat it this year. It is a simple slatted type fence with gaps between the slats. I have tended to use Sika wood treatment on all my exterior wood and was going to use the same here. I have now discovered that this treatment needs a sealing coat on top of it. I have never had a problem in the past with not overcoating this treatment on garden benches and other external wood but if it is advised to overcoat this then I would rather do so. I don't want to change the colour of the wood so what would be an easy to apply matt overcoat for this. Is there a treatment that does the lot, i.e. prevents mould and rot and acts as a sealant? Thanks.