What kind of glue can be used to bond a bumper?
3 Answers
The bumper can be bonded using structural adhesive or strong glue. The function of the bumper is to absorb and mitigate external impact forces during collisions, protecting the front and rear parts of the vehicle body as a safety device. The methods for repairing bumper scratches are: 1. Apply toothpaste to shallow scratches and wipe with a soft cloth in a counterclockwise direction; 2. Spray car paint scratch repair agent onto the scratches and wipe with a towel; 3. Use a touch-up pen to spray and fill the area to be repaired along the direction of the scratch, and apply fine wax after it dries. The components of the bumper are: 1. Outer panel; 2. Buffer material; 3. Crossbeam.
I previously repaired a car bumper using a specialized epoxy adhesive for automotive plastics, also known as AB glue. This adhesive consists of two components that need to be mixed in a specific ratio. Before application, the cracked area must be roughened with sandpaper, cleaned with alcohol to remove grease, and then the adhesive is evenly applied before pressing the crack tightly together. Most bumpers are made of polypropylene or ABS plastic, and ordinary super glue (502) or hot melt adhesives won't hold well because they can't bond with the plastic molecules. I've tried repairing small cracks myself—after applying the glue and waiting 24 hours for complete curing, it's held strong for over two years without issues. However, if the bumper is severely deformed or has extensive damage, it's recommended to replace it entirely—safety first.
In our repair shop, we often choose polyurethane structural adhesive for bumper repairs. This adhesive offers strong bonding and good elasticity, capable of withstanding driving vibrations. First, use a cleaner to remove the release agent from the plastic surface, and if necessary, apply flame treatment to enhance adhesion. Ensure the temperature is above 5 degrees Celsius during operation for optimal adhesive performance. The most reliable method is to combine it with a plastic welding gun—first weld the crack, then apply the adhesive for reinforcement. A reminder: don't rush to drive after the repair; let the adhesive fully cure by leaving it undisturbed overnight. The cheap adhesives used by roadside shops simply won't hold up—they're guaranteed to crack within six months.