There is no point in changing a part due to a simple lapping, because in modern realities, local repair works wonders, returning the element to its original appearance without unnecessary expenses for buying a new bodywork. The master will completely clean the damaged area down to the plastic, remove cracked layers of the old material, apply a special elastic primer for plastic and carefully level the transition zone with a liquid polymer. Moreover, to ensure that the color fits perfectly and the boundaries of the repair are not visible, you will not have to paint the entire bumper - the colorist will select the tone using a spectrometer, and the painter will make a delicate cut only on the damaged corner, covering the entire surface with high-quality glossy varnish. If you are interested in learning how exactly the plastic structure is restored, how long it takes for modern plasticizers to dry, and how the accuracy of the gaps after dismantling is controlled, I recommend studying the information on https://autobodylab.com/services/bumper-repair/, which contains a lot of useful advice from qualified body shop painters. I myself recently picked up my wife's car with a similar problem: everything was done so delicately that even in direct sunlight it was impossible to find the line where the original paint ends and the repair area begins. Therefore, do not be upset over an annoying little thing, feel free to give your car for local restoration, save your budget and enjoy a perfect mirror result in just a day or two!
