I'd be looking at acrylic rattle cans from an auto parts place ( or the green shed if you're brave ), shoot the paint in the carpark and then get back into the flat, her indoors is going to hate the smell which ever way you do it.

Word of warning, when I did the final coats on The Count it was incredible hot and humid so I hung it inside, next morning the budgie was dead and I think it may have thought the strat body was a big bird of prey.

Fortunately the wife was at the weekender at the time so I didn't have much explaining to do