I've saved a handful of planks from my old back fence after replacing it, and plan to turn them into indoor furniture (coffee table, etc.). After some experimentation I've decided I want to seal and finish it with oil-based polyurethane and no stain.
But I'd like to know if I should take any special measures against drywood termites beforehand. I'm not keen to use anything strongly coloured or to drill holes in it, as is required by so many wood treatment options, because the wood's being used decoratively.
Various sites suggest orange oil to kill off anything still living in there and to break down pheromones which might otherwise attract more termites, but I wonder if this job isn't already taken care of by the solvents in the polyurethane.
Could I simply thin my first coat of polyurethane using orange oil? Or will any (more appropriate) paint thinner do just as well against termites? Or do I need a dedicated treatment beforehand?