You can try the bumpers on your own. This will require epoxy adhesives (e.g. Poaxiol), construction grid (serpyanka), macar scotch, alcohols and metal mesh. The tools will use a soldering-iron, hammer, screwdriver, and a knife.
Before performing the work, the bumper should be removed and well washed and repaired. Outside, the paint can be sprained and the cracks are in the right position. In the inner part of the bumper it is necessary to attach a metallic grid to a crack and to give it a shape of the bumper, the mesh should be perfectly located.
Now, you need to warm the mesh so that it starts to melt the bumper and dive into it. The grid needs to be crushed with a screwdriver. The main thing here is to be careful not to melt the bumper through. Once the surface is cooled, it must be degreasing, epoxy glue, and a surplank, one or more layers. It'll make it strong. Gotta let the glue dry and set the bumper.