I just checked the insert nuts and barrel nuts (everything else is stainless steel) and they are zinc plated. Does this mean that the galvanising spray won't add anything to it?

I was thinking that ideally I would have something I could paint on the barrel nuts before inserting and then maybe pour into the hole once tigtened. The insert nut is more tricky as even if I paint it it is likely to scrape off when putting into the wood and also when the thread bar is inserted. Better than nothing I guess but not ideal. I could pour something down the thread I guess but would this have any real impact given thread itself is stainless steel