Painting plastic trim on window boards

[WabbitPoo]

I'd like to smarten up the window boards in my conservatory. The longer sides have joins in them (not sure why!) and the plastic trims have gone yellow. WHat's the best way of painting them white again? A quick rub down, a coat of BIN, then the satinwood water based top coat Im using for the rest?

 

[opps]

Do you want to paint the trims exclusively or the panels as well?

 

[foxhole]

Rattle can spray .