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Plastic repairs

1620 Views 11 Replies 7 Participants Last post by  crashmasterd
Has anyone had any experience with one of the Plastex plastic repair products for fixing bodywork and such? I need to make some small repairs to my rear bodywork before painting and would like some advice, if you would.

I suppose I could just use epoxy, but I'm not so sure about it's compatibility with this type of plastic. Is it ABS? The bottom of my tank actually says "Ascerbis"!

I've also found links to something called Three Bond Plastic Repair Kit. Is this better, worse, or exactly the same thing? Is there something better than either?

Due to my situation I see no reason to spring for an expensive replacement piece of bodywork, and the repair wouldn't be very big. It's all getting painted anyway.

Any advice is appreciated.

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Thanks for that link, Speedcubed. That answered all my questions. They have a form of Plastex (called Plastifix) that they recommend, as well as plastic welding and Epoxy. Apparently what I have is ABS, and all of these methods will fix it.

I may stick with Epoxy, because I'm familiar with it's use and have quite a bit of experience with it.

Devi, I think the Plastex stuff is exactly what you are talking about: a Cyanoacrylic with a powdered plastic filler. I just can't find any actual information about it's formulation.

On the other hand, I may try the Plastex method just to learn something new.

I'll keep you all updated.
On 2007-02-07 19:01, Legman wrote:

In place of Bad Tree, Crash could put..."Dumbass rider''....
ha ha ha........sorry Crash....couldn't help it :razz:
No problem my man. I just chock it up to the perversions of living below the equator. I would take offense, if it weren't so true.

I have a better idea: "Gravity Sucks!"
I've been playing with the Plastex stuff now for about a week. It works pretty good, and on the whole I'm pleased. The stuff is stupid strong, and even if I were worried about it you can imbed fiberglass mat in it for extra strength. It bonds quite well to the ABS that the bodywork is made out of. It also sands easily and seems to be exactly the same stuff as the ABS once it has cured.

Good things: Bonds quickly and can be used to mold tabs and/or protrusions. The molding bar that comes with the kit is simply great. Heat it up to 150º F and you can mold it like clay, then when it cools it hardens until it's about like tire rubber. The Plastex stuff won't stick to it at all. Great for re-creating those little tabs you've broken off. Also, the Plastex fills cracks neatly and can be dammed with regular packing tape or electrical tape. This produces a nice smooth finish that requires little sanding. Because of the fast set time you can do a lot of work in a short amount of time. However, be sure to give it a couple of hours before sanding.

Bad things: The Plastex bonds quickly, and partially sets up in about 10 seconds. This can make it difficult to move it to where you want it. At the same time it can flow down into areas where you don't want it to be unless you are careful. The raw liquid doesn't stick very well to painted parts, so you really need to remove any paint from where you need the repair. I found the substance to be difficult to use as a body filler due to it's short working time and it's tendency to hump up like a weld. For finish work I would still use some kind of epoxy filler.

Basic techniques: The included video shows the guy putting a couple of drops in a cup full of the powder and lifting that up with the eyedropper to use like a welder. I was unable to make this technique work very well. I found it was easier to fill the gap with a generous amount of powder and then use drops of the liquid to spread it out into a weld like seam. This works well when filling molds too. With any crack it is best to V out the crack quite a bit and scrape all the paint off both sides. Then use packing tape (the clear plastic stuff) to cover the cracks on the "good" side.

Anyway, so far so good. I'm liking the stuff and I'm seeing good results so far. Can't wait to see how it paints.
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