Sand down the area of damage with 36 grit or 80 grit. Make sure to sand past the damage an inch or two. Once sanded down to raw plastic, use your heat gun with welding tip (If you don't have a heat gun with welding tip contact Spray King and we can help you order a quality tool).
Line the two edges of the crack up and with your plastic welder and heat both sides of the crack. Once hot and melted apply a wire mesh across the crack and melt that mesh into the bumper. You will need extra plastic to use as a filler to cover up the wire mesh. I use old bumper pieces from junk yards but many use fibreflex. Fibreflex works good but costs money, I am into keeping my expenses down and a raw bumper in my opinion is much better to weld into a bumper than fibreflex. I find that raw bumper holds a bit better than fibreflex.
Once the wire mesh is melted into the bumper, and extra plastic is added use the plastic welder to level it as best you can. From here I take my DA sander and use 120 grit to sand smooth, if your crack runs across a bodyline or edge I recommend using a sanding block to shape the edges. Once you sand it down with 120 grit I take a flexible glaze putty and fill in any imperfections in the bumper repair. Let that dry (I use a heat gun on low temp to speed up this process). Once the glaze putty is ready for sanding sand it smooth, prime it and finish it off as usual.
This is basic information and expected that your experienced in performing mobile paint repairs. If you require training please contact Spray King and we can teach you everything you need to know and be a confident mobile repair tech.
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