I just did my first touch up – – Ink breaks on an all black glossy poster. I found I had to press surprisingly hard on the poster to get the black down in the breaks. Would softening the tip with water help with that? One small tip I can offer is buffing with bestine. The bestine lifted the extra black pencil off anything glossy and it also softened the black helping it get down into the breaks more thoroughly. And as was mentioned in another thread, I successfully used bestine soaked cotton balls to lift fingerprints off the glossy surface.