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Why Do Bumpers Peel and How to Repaint Them

Model: (Various brands) Various
Part: Body

Video tutorial

This explains why plastic bumpers peel: primarily due to lack of sanding and failure to use a specific primer for plastic; the paint does not adhere and peels off after a short time. Additionally, the plastic primer has a recoat timer: it must be covered within 30 minutes of drying, otherwise it loses its gripping effect.

During moulding, plastic is mixed with release agents to facilitate separation from the mould; these residues can resurface and over time cause the paint to lift. They can be removed with flame treatment.

Plastic expands and contracts much more than metal, while paint has limited elasticity and can crack or peel over time. Moreover, if too many layers of paint are used, it becomes too rigid and cannot follow the movements of the plastic, intensifying defects.

Remove the detached paint, flame the entire surface, sand with 600/100 grit without scratching too much, clean with anti-silicone, apply a flexible primer and within 30 minutes apply a matte base coat = 1 light coat + 2 full base coats, then apply the clear coat (again, one light coat and one full coat) and allow to dry for 34 hours before reassembly.


Posted on 8 May 2026 by ScegliAuto


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How to Set the Clock on a Renault Master 3

This guide shows you how to set a new time on a Renault Master 3. Start by turning on the instrument cluster of the vehicle without starting the engine. Next, using the end of the right-hand steering column stalk, scroll through the options on the display until you reach 'set time', then press the down arrow button to make the displayed time blink. Once this is done, press and hold the down arrow button to change the hour, which you can adjust using the two arrow buttons at the end of the stalk. Once the correct hour is set, press and hold the down arrow button again to move to the minutes. After setting the correct time, restart the vehicle.

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by ScegliAuto

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