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With the increasing use of plastics in automotive engineering, plastic repairs gains more and more importance. Instead of replacing e.g. the full bumper plastic repair allows to reduce material costs and helps recycling. For a more sustainable repair.

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In our instruction we will be showing a bumper repair using TEROSON® PU 9225. This is a product recommended for holes, scratches and cracks larger than 7 cm. For fast applications smaller than 7 cm you may also use TEROSON® PU 9225 SF or TEROSON PU 9225 SF ME. 

All repair and maintenance tasks shown should be done by professionals only. Please do not try this at home or if not qualified by professional education. Always follow car manufacturer's instructions.
Limitation of liability


Cleaning and Surface Preparation

Remove all major dirt and rinse plastic part with plenty of clear water. Clean and pre-treat repair area using TEROSON® VR 10 with lint-free cloth. Allow 5 mins flash-off for solvent evaporation.


Pre-treatment of the damaged area

For cracks drill out hole at the ends of the crack. Hole diameter should be about 6 mm to stop further cracking. Enlarge the crack to the minimum 2-3 mm gap. In case of a hole go to step 3 directly.



Use e.g. belt sander to grind a V-groove into the front-face edges of the repair area. Best results are achieved with P80 grit. The holes at either end should also be V-tapered with a grinder.



Sand surfaces on both faces with P120-150 grinding paper. Remove the grinding dirt. Don't forget to also sand the back of the damaged area. Clean and pre-treat both faces with TEROSON® VR 10.


Primer Application

Spray a thin coat of TEROSON® 150 primer onto both faces. Flash off time is 10 minutes at room temperature. Cut a piece of fibre mesh larger than the damage (minimum 1 cm larger than the damaged area).


Preparation of the cartridge

Open the cartridge and squeeze out a small amount of material until both adhesive components run equally. Apply the mixing nozzle and discard the first 5 cm of the mixed adhesive.


Application Back I

Apply TEROSON® PU 9225 to the back of the repair area. Position the fibre mesh over the damaged area and press it down into the adhesive with a spreader until the mesh is saturated.


Application Back II

Apply adhesive on top of the mesh and spread it to cover the repair area completely. 


Curing Back

Cure adhesive at room temperature. To speed up cure use an infrared heater at 60°C to 70°C for 15 minutes. Allow to cool down to room temperature before continuing on the front.


Application Front

Apply TEROSON® PU 9225 to  the front face, keeping the nozzle inside the adhesive to avoid air pockets. Smooth down with spreader, always from the centre of the damage outwards. Repeat cure as in STEP 9.



Sand to remove excess adhesive on the front face and restore original shape of the plastic part. Start with P150 grit paper and progressively use finer sand paper grits (to P260).


Surface Preparation 

Clean and pre-treat repair area using TEROSON® VR 10. For optimal adhesion of plastic filler, apply a thin coat of TEROSON 150 primer. Allow 10 minutes flash-off time.


Application of Plastic Filler

Apply TEROSON® UP 250 Plastic Filler. Sand down the cured plastic filler and then proceed as instructed in the refinish instructions of the paint manufacturer.

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Limitation of Liability

The information provided herein, especially recommendations for the usage and the application of our products, is based upon our knowledge and experience. Due to different materials used as well as to varying working conditions beyond our control we strictly recommend to carry out intensive trials to test the suitability of our products with regard to the required processes and applications. We do not accept any liability with regard to the above information or with regard to any written or verbal recommendation, except if otherwise explicitly agreed and except in relation to death or personal injury caused by Henkel´s gross negligence or intention and any liability under any applicable mandatory product liability law. Please note that the information provided by us may not be current, complete and correct. It is not intended to serve as legal advice. Each user is solely responsible for assessing and ensuring compliance with any applicable law. The information is protected by copyright. In particular, any reproductions, adaptations, translations, storage and processing in other media, including storage or processing by electronic means, enjoy copyright protection. Any exploitation in whole or in part thereof shall require the prior written consent of Henkel Corporation. Except as otherwise noted, all marks used in this sell sheet are trademarks and/or registered trademarks of Henkel and/or its affiliates.