If flexibility of repair is what you need then Plex is the Key.
Plex is both flexible and versatile when it comes to plastic repair.
It has a high degree of adhesion for modern types of plastic.
Great spreadability for smoother finish.
Easy sanding for quick repairs.
Plex comes in a handy 0.6L package (inclusive of Hardener and Plastic applicator)
Proworx Plex Automotive Bodyfiller 0.6L