As some of you know fixing a plastic bumper isn't easy. For one fiberglass will not stick to it very well and bondo will only stick a little depending on how you sand it. The other problem is finding a new bumper is hard and expensive, and when you do finally find one you have to give your left nut just to get it shipped to you. Then you have to paint it. By the time your done with the whole process you just spent somewhere in the neighborhood of $400-600. This repair only cost me around $40-50. So I recently did a bumper repair my self, and cheapely so I wanted to pass it on to my fellow mazda nuts. So here it goes.
First off here is what you will need:
Bond plastic repair kits
80 grit sand paper
Finer sand paper(100 grit and up)
Sandable filler primer
Duplicolor clear coat
First off, a tip on keeping the painting process cheap is going to your local autopaint store and have them mix a quart of paint per your color coad and have them put it in a spray can for you. That way you can paint it your self.
1: Access the damage and figure out what you need to fix. Here is what I fixed on my bumper:
Fixed a hole where a trailer hitch went through my bumper, and I also deleted those ugly liscense plat wholes and mounted my liscense plate on my lower grille.
Deleted side marker lights and fixed crack from hitting a snow bank a while back.
2: Now on to some actual work. First off take these bondo patchs:
and put them behind any cracks and holes behind the bumper. These patchs are made of a metal mesh and ar sticky on one side so you can stick them to your bumper. These alow the bondo something metal to bond to.
3: Next take your bondo plastic bumper repair glue and spread it along the bondo patchs on the back side of the bumper to help the patchs adhear to the bumper. Also use this bumper repair glue on edges where bondo meets plastic:
This will keep the bondo from seperating from the plastic