What is the best way to repair a cracked fender? Can I weld it?.......

 

We have had limited success with a plastic welder, depends on where crack is and how big. Long cracks are going to need some backing, also hard to get to look nice .

 

I had some decent luck on an older quad using fiberglass joint tape and epoxy. I just sanded the back side filled the crack with some of that colored liquid plastic stuff they advertise for upholstery. Then I put a couple strips of the tape on the back and covered it with epoxy super mend. Worked really pretty well and you had to look hard to find the crack from the outside. Was a cheap solution with what I had in the house at the time. Held up for the year or so we owned the quad. I have used method to fix other plastic items since glue doesn't work well on most plastics. Just sand the back with a course paper so you give the epoxy something to grab.