Years and years of gloss painting with a brush. Then a while back came across gloss rollers.
With minimal effort just keeping the edge wet you get a perfect finish. Done boat hulls, foils and numerous jobs around the home.
5 rollers for £4. You can cover with cling film and reuse a limited time later. Don’t bother cleaning, sounds bad but probably better than contaminated white spirit. I also believe that the biggest issue with paint and varnish finish is dried material coming out of cleaned rollers and brushes.