No don’t just paint it, well yes do but..:-
Wash it with sugarsoap (its bound to be dirty)
Paint with a problem solving primer (Blackfriars or Zinnser bullseye 123 plus)
Then you can paint it with whatever (emulsion rather than oil based would be my choice)
If you just throw paint at it you may suffer in the future, or not, but it’s not worth the risk.