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Epoxy techniques
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Posted by Stephen Goldberger (more from Stephen Goldberger) on Sun, 16 Feb 2003 17:58:29 Share Post by Email
In Reply to: Heater mixer flap shaft broken..., RACR9KT, Sat, 15 Feb 2003 12:40:23
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The key to a successful epoxy repair is to remember it is an *adhesive* and not a *weld*. The basic epoxy chemicals are clear. When it is a liquid, is "wets" the surface, soaking into the nooks and crannies that make up the surface. Then it hardens, but its tensile strength is not great, and it's crack propogation properties are not great - it's pretty brittle.

When you open a tube of "2 ton exoxy" or "JB Weld" and find it is opaque, it's opaque because a filler has been added to the epoxy resin. The filler forms a crack-stop and enables the hardened chemical to be a lot tougher.

For repairing something like your plastic flapper, you want the surface to be completely clean, you want to roughen the surface (make figure 8 swirls with fine-grit sandpaper to create a non-directional texture), and you want to use a slow-curing "filled" mixture.

The fracture surface is probably quite small, so your repair will be more reliable if you use a bit of aluminum, brass, or iron sheet metal as a patch on both sides of the break. Assuming it's not on a pivot point. I don't have a picture of the break, so I can't recommend exactly, but you can make the repair substantially stronger than the rest of the part.

Good luck.

posted by 24.166.10...

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