Polyurethane Plastic Welding Rod, 1/8 in. diameter, 30 ft, Natural
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Yes, a rough grit paper, such as 36 to 80 grit, should be used. It will, however, peel back at the edge if the adhesion isn't up to par. You won't be able to get a paintable finished product unless you use filler over the entire repaired area.
This is a solid polyurethane welding rod that measures 1/8" in diameter. It's not hollow at all.
That is exactly what it is intended to accomplish. You'll need an airless welder to apply the rod, such as the 5700HT Miniweld Model 7.
Only urethane bumpers are repaired with this rod, which melts at a low temperature. Urethane bumpers are made of a thermoset plastic that is usually yellow in color and extremely flexible. Using an airless plastic welder like the 5700HT MiniWeld Model 7, this rod acts as an adhesive to reassemble this type of bumper. Most urethane bumpers are also labeled with the letters PUR, TPU, or RIM. If the bumper you're fixing is black, it's probably made of polypropylene, TPO, or a similar plastic, and this rod won't work.
Selected User Reviews For Polyurethane Plastic Welding Rod, 1/8 in. diameter, 30 ft, Natural
There is a moderate amount of adhesion. On a corvette bumper, this compound worked reasonably well. It is important to note that it cannot be used with any metal reinforcing screen. It's just not going to work out. It's a very thin cord, and filling in the crack takes a lot of it. A thicker cord, in my opinion, would burn less and thus adhere better. There is a moderate amount of adhesion. After you've gotten under the edge, you can peel it off. I expected this to be a quick fix, but it has held up for a couple of months after I purposefully left it out in the elements to see what would happen.
It really works. Watch Polyvance's YouTube videos to learn how to repair an expensive bumper that would have been useless otherwise.