Active woodworm needs to be treated with a woodworm killer. The wood should then be treated with a suitable interior or exterior wood preservative which will help to prevent future infestation. See our full range of woodworm treatment products and wood preservatives. Wood that has been finished such as furniture, floorboards and doors should be stripped of any wax, oil, varnish or paint to ensure that the woodworm treatment and following preservative is able to effectively penetrate in to the surface of the wood grain. If you want to use a water based paint over a preservative use one that does not contain wax.