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Inner Fender Liner Repair


Inner fender liners are not expensive parts, but if you have one of Polyvance’s nitrogen plastic welders and you can fix it quickly, why not take advantage of the opportunity to save cycle time and money? This video will show you how to do the repair. Inner fender liners are usually made of polyethylene
or polypropylene. To select the proper welding rod, look at
the ID symbol molded into the part. If you see “PE”, use the R04 polyethylene
welding rod. If you see “PP”, use the R02 polypropylene
welding rod. Both of these materials are available in black,
so you won’t have to worry about cosmetic refinishing. Here we’re using R04-04 black ribbon. Just put some of Polyvance’s heavy-duty aluminum
tape on the underside to support the melted welding rod as you make your pass across the gap. Start welding the ribbon on one side and make
one continuous pass over the aluminum tape, finishing by locking in the weld on the opposite side. Make as many passes as necessary to fill the
missing plastic and to build the thickness as required. Once the weld is complete, you can quick-cool
the hot plastic with compressed air. Make sure the plastic is completely cool before
you sand it or test the strength. He we are using 50 grit sandpaper on an angle
grinder to do a rough shaping of the welding rod. Cosmetic appearance is not usually important
on fender liners, but if you prefer a smoother finish, you may continue sanding the plastic
with 80, then 180 grit paper, or finer if you prefer. We’ll use the 6125 carbide cutting burr to
open up the mounting hole to the original dimensions. Now the fender liner is ready to install
on the vehicle. Just to demonstrate the strength of the weld,
we’ll do a little tug-of-war on it. As you can see, the strength of the repair
is more than adequate to send it down the road.

Bernard Jenkins

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