we used to get a product from Leyland Paints, not sure if it was terabine or not, small bottle with a purple tint, we used it when it was particularly cold, I think it was a called ‘dryers’ or similar.
Never heard of it over here but I do have a can of Japan Dryer bought at a local paint store.
If it’s already been painted maybe try directing a fan to blow across it or as a last-ditch effort mist it with hydrogen peroxide.
During the winter months I generally add hardener to my paint.
Love….Jill
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