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Post by jerseyboy on Jun 10, 2014 8:15:23 GMT -5
I found a small crack in one of my plastics yesterday,,did some research and found a few methods for repairing these cracks using fiberglass dry wall tape,two part epoxy,ABS(black cement for plumbing),drill holes for reinforcing wire,bondo,sanding,primer and paint.
Just wanted to start a thread on this to see some of your ideas,,because its only a matter of time before your Chinese scooter has a cracked panel,,believe me when I say that,,lol
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Post by bandito2 on Jun 10, 2014 11:06:19 GMT -5
I very recently got done restoring a wrecked Honda Reflex I'm selling (spoken for already/sold) and used some stuff called PLASTEX Plastic Repair. It uses powdered plastic substance with a liquid solvent and repairs better than epoxy since it is more of a native material. I used the heat softened rubber material to make a mold by pressing it onto a similar piece to make the shape, then use the powder and liquid to build up material in the mold. PRESTO!! a duplicate repaired tab built right onto the main piece. Also used it to repair a crack and to hold a threaded brass fitting into the plastic which would never stay in with epoxy and reattached a broken off piece. A bit on the pricey side maybe, (you don't want to be sloppy and waste it) but it works better than anything else I've ever tried for plastics repair. I managed to remember to get some pics of the front cowl work. Here is a picture of the cowl with the broken/missing pieces. i1183.photobucket.com/albums/x467/bandito_two/P1020901_zps84c13c85.jpgHere is a pic of the repaired part. The rubber mold was later removed when the repair material was done setting up and hardening. Then the opening was cleaned up with a round file and outer part smoothed flat then it was painted. i1183.photobucket.com/albums/x467/bandito_two/P1020905_zpsc56de4ca.jpg |
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Post by rockynv on Jun 10, 2014 12:26:03 GMT -5
A lot of the plastics are not really ABS and are more than likely a form of PVC. I had used PCV pipe cement with good results and CPVC cement on those that did not respond well to the PVC. It is a solvent that chemically welds the plastic back together.
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Post by dev150cc on Jun 10, 2014 12:42:48 GMT -5
I've done a few repairs. I successfully used the mesh sheetrock tape, several layers, with either two-part epoxy or (I think) black CPVC cement. There are lots of threads out on the web to follow.
If you have a creeping crack, that's the only time I'd consider drilling necessary, but then you have the hole to deal with.
With my current scooter, there was a plastic crack in the body work when I received it, so I used the epoxy/mesh method, and added a bit more, spread wider, to reinforce that stress point.
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Post by jerseyboy on Jun 10, 2014 13:07:25 GMT -5
Great ideas so far,,
I'm very interested in the PLASTEX,,also I like the idea of the PVC cement,,it seems like it melts the plastic together as well as cementing it..very nice.
I have a small crack in my side plate that wraps my seat,,it has no starting point,,its in the middle of the piece,,i may just try the fiber mesh tape and some PVC cement for that on the underside only.
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