Repaired by heat fusing and grinding a āVā groove and filling with polypropylene filler material and structural support (stainless steel screen) to the backside of the cracked material. Thermoplastic Poly Propylene- PP is semi-flexible, melts & smears when grinding, waxy or greasy feel. You must use a cleaner and adhesion promoter prior to adding any filler material. However, TPO IS repairable as long as you know how to prepare it. Body shops prefer to discard a TPO bumper because the repair is so difficult The embedded wax makes it difficult for filler, adhesive, primer and paint to stick. TPO bumper covers are the most difficult to repair because they contain 3% to 5% wax-based mold release within the material. TPO bumper material sands in chunks melts like butter with high-speed grinders, feels like wax and gets stringy when hot, so keep this in mind when trying sand or grind a TPO bumper cover.
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