spraying floor Joists

Hi folks I am going to be spraying wood worm treatment (Boron) on my bathroom floor joists. Will it affect the plasterboard below? I.e. make it go soggy? I was thinking of using a fence sprayer. I just did a search and cannot belive that no one has written any thing about wood worm on uk Diy!
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Housemartin coughed up some electrons that declared:

I wouldn't have thought so.
When I cleaned my roofspace, which was full of mouse and ratshit, I sprayed water based disinfectant liberally with a garden sprayer making the ceiling PB quite damp with no ill effects (though it might possibly cause painted ceilings to stain but that wasn't an issue for me).
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