Kugeza ubu, imiyoboro ya PPR ishimangirwa na fiberglass ku isoko irazwi cyane kandi igurishwa neza. Kubwibyo, PPR ikirahure-fibre umuyoboro wo gukuramo ni amahirwe ashoboka. Imashini ya LB yibanze kuri PPR ikirahure-fibre ikuramo imyaka myinshi. Dutanga ibirango byo hejuru nibice byiza byimashini.