Delgirl, I used Protim; I only had a small room area to treat so I did buy the 5l tin. Richard is right in what he says about sap wood and wood with a high moisture content, as all the reference sites will confirm. But I've seen re-infestation of dry hard and soft woods so I wouldn't necessarily take a chance on it. I know that new softwood structural timbers, if kept dry, are unlikely to suffer an infestation.
The company I work for have used the Boron based products in conservation work. They certainly are easy and more pleasant to use than the solvent based products but are probably a little OTT for the situation you describe.
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