Might I suggest that you ride the bicycle for a while before begin changing this or that. That said, I know little about that particular bicycle, but do publish a website intended to help people, new to the interest of vintage bicycle, get a head start and avoid costly and frustrating mistakes while doing so. Painting the top tube might well prove to be a mistake down the road.

Anyway, if you wish, take the time to visit MY "TEN SPEEDS" and focus on the Finding Pages to get you up to speed quickly.

Hope this is a help.