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.