Page 8
www.urethanesupply.com
side of the tab. Cut the tab out of the PP sheet with a jigsaw, and
drill out the mounting hole.
b.
Create hinge line
. To create the hinge line, put the tab in a vise
and fold it back and forth several times along the dotted line you
drew on the tab. Take it out of the vise, then fold it over double a
few times to make it more limber. This is flexible and much stronger
than the original bumper’s hinge. If there’s a hook or fold in the tab,
you can create it by folding it in the vise one time.
c.
Notch back the bumper.
Place the new tab in position on the
bumper and mark the cut line on the bumper with a Sharpie. Cut
out the notch with a jigsaw.
d.
Prep the bumper
by removing paint and applying sanding scratch-
es the bumper on the backside.
e.
Tape the tab in position
using 6481-1 or 6485 aluminum tape on
the outer surface.
f.
Weld the backside of the tab
using R14 or R13 rod. The R14 is
much wider and will make a stronger weld. Start by focusing the
stream of hot nitrogen about 1/2” beyond the tab until the bumper
turns glossy. Stab the rod down and start making your pass using
the same technique as described earlier.
g.
Prep the outer surface
by grinding a shallow v-groove about 3/8”
wide along the seam. Feather back paint and put down some sand
scratches with 80 grit in a DA. Blow dust free.
h.
Weld the front side of the bumper
with R13 rod. Lay one strip
down along the long seam, then weld each end and wrap the weld-
ing rod around the edge. If you have an airless welder, you can melt
and burnish everything down and make it easier to sand flush.
i.
Let cool and
f
inish the repair
by sanding smooth with 80 grit in
a DA. Use filler if necessary to fill out any low spots, then sand with
180 and 320 grit to prepare for primer.
Step B - Create hinge line by bending
back-and-forth in a vise
Step B - Create corners by bending once
in the vise
Step C - Notch back into the bumper to
mount new tab
Step F - Weld the tab into place using the
R13 or R14 rod
Visit
www.urethanesupply.com
for videos and other instructional re-
sources. Check out our
YouTube
channel and become a fan on
for periodic plastic repair tips.
We are committed to providing the most complete information on plastic repair
and re
fi
nishing in the industry. Call
800-633-3047
for technical support,
Monday through Friday 7:00am - 4:00pm Central.
Urethane Supply Company
1128 Kirk Rd, Rainsville, AL 35986 USA
phone: 256-638-4103 fax: 256-638-8490
