Fibre bodi kits not good???

[5er]

Planned to change my bumpers (stock) to a nicer look using fibre but was informed by someone that for the fibre type, the surface will become 'hilly' after a while. Is it true? or anybody face this problem? Or any other problem if I use the fibre body kit?

 

[The Necessary]

Please explain in exactly what way this topic has anything to do with BMW M cars.

Towed.