1. Always identify the type and code of plastic to be repaired, in order to check whether the surface material is compatible with the particular product to be applied.
2. Do not apply plastic filler over a painted surface without the correct preparation. Fillers will not obtain maximum adhesion which is critical when repairing plastic parts.
3. When repairing a crack in a bumper, surfaces must be cleaned properly. Use soap and warm water with a scuffing pad to thoroughly clean the area to be repaired. If the repair is to be filled, sand paint from the surrounding area approx 10 – 20mm around the damage, to achieve full adhesion from any Plastic repair materials 
4. Before filling a crack in a bumper, drill a small diameter hole 4/6mm, just above or below the end of the crack. This will release the stress point and prevent the crack worsening when the plastic part is under stress again. 
5. Coat repair surface with TechniQ 34480 Powerplast Adhesion Promotor / Plastic Primer 
6. Inject TechniQ Powerbond plastic repair material into the drilled hole and into the crack to act as a mechanical weld and prevent further damage or stress cracking.
7. Always shallow ‘V’ sand out the surface area of any crack, so that you can apply enough material into the V and create a repair with enough material to obtain maximum strength.
8. Finish off Powerbond bumper and plastic material repairs with TechniQ FLEXI Premium body filler for a finer finish which can be sanded and directly primed over.
9. When sanding FLEXI Premium filler plastic repair, always select the correct level of sandpaper or abrasive discs, so that bumpers and plastic parts aren’t being sanded too aggressively.

Can plastics or bumpers be repaired with standard polyester body fillers?

No, standard body filler will adhere initially, but will not be anywhere near flexible or strong enough to withstand the vibration or stress that plastic parts such as bumpers are subjected to on a daily basis. TechniQ Flexi Premium filler is specially formulated for maximum flexibility and adhere to most common plastics used in the automotive industry. These include PP, EPDM, ABS, PC, PPO, PA, RTPU, PBTP, PVC, PUR, UP-GF. If you use standard polyester filler in a bumper it will most certainly shrink, causing any subsequent painting to crack. The filler may even fall out of the repair altogether. Always check to ascertain whether the plastic part to be repaired is compatible with the material to be used for the application.

My bumper is severely damaged and has a large hole, Can I repair it with filler?

If the hole in the bumper is no greater than the size of a 50 pence piece, then crack seal tape could be used on the reverse side of the bumper and the front side filled with TechniQ Powerbond bumper repair adhesive and subsequently with TechniQ Flexi Premium filler. Generally any plastic repairs where the hole or damage area is greater than a 50 pence piece are not possible using flexible material alone. These types of ‘holes’ or damage will require an evaluation by a professional body repair shop. Always check to ascertain whether the plastic part to be repaired is compatible with the material to be used for the application.