I have just purchased a bottle of woodworm treatment that kills all wood boring bugs and mites. It can be applied by brush, spray or dipping. It has a high strength so needs to be diluted 25 to one. It absorbs into the timber and acts like a preservative and has a 30 year protection guarantee.
It can be painted or varnished over when dry and is colourless. My plan is to inject a solution through the planking on the hull in various locations and to repeat the proceedure a few times to ensure good coverage. I will moth ball it and my work area too incase I have further colonies hidden away. I have enough of this liquid to treat all future timber that I may use for building. Every plank in future will be dipped for bending and forming in the solution.
At least my ships will out live me.
Well, that's the plan anyway.