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epoxy to epoxy?

Old 01-19-2007, 07:46 PM
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Jon.
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Default epoxy to epoxy?

Can freshly mixed epoxy be bonded to cured epoxy? I have to halves to a fiberglass propeller and I need to bond them together. Thanks

Jon.
Old 01-19-2007, 09:13 PM
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Newc
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Default RE: epoxy to epoxy?

I have to halves to a fiberglass propeller and I need to bond them together.
A joke, right? You don't really expect to use a prop that's been in two pieces, do you?
Old 01-20-2007, 02:21 AM
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grimmy55
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Default RE: epoxy to epoxy?

thats got to be a brave man to do that still wind the revs on stand back and watch DUCK!!!!!!!!!!! oh ****
Old 01-20-2007, 08:48 AM
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bkdavy
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Default RE: epoxy to epoxy?

The strength of a fiberglass part comes from the fibers, not the epoxy. Do not attempt to repair a broken prop. If you can't afford the new prop, you're in the wrong hobby.

Brad
Old 01-20-2007, 10:58 AM
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Jon.
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Default RE: epoxy to epoxy?

It won't be under alot of stress, Its going to be for a park flyer. The prop is no longer than 10in.
Old 01-20-2007, 01:14 PM
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stang
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Default RE: epoxy to epoxy?

There's moer stress on that prop than you imagine! Don't glue the prop back together, please buy a new one. Glueing props is just a dumb idea.
Old 01-20-2007, 04:23 PM
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dreadnaut
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Default RE: epoxy to epoxy?


ORIGINAL: Jon.

I have to (two?)halves to a fiberglass propeller and I need to bond them together. Thanks

Jon.
The cured epoxy needs to be cleaned with acetone, then scuffed with sandpaper. When you mix the epoxy, the blade of a broken propeler works real good for a mixing stick. There aint much else it's good for.[sm=75_75.gif]
Old 01-20-2007, 09:28 PM
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Newc
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Default RE: epoxy to epoxy?

Jon - Do you get the overall picture that gluing prop parts back together is a bad idea even for ‘park flyers'? I hope so.
Old 01-20-2007, 11:14 PM
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Jon.
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Default RE: epoxy to epoxy?

When I say two halves I don’t mean a left blade and a right blade, I mean a top surface and a bottom surface. I built the prop from scratch, its not a damaged prop.

Jon.
Old 01-25-2007, 09:21 PM
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kd7oir
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Default RE: epoxy to epoxy?

This is how I'd fix it and you'd get alot safer and beter performance.
http://www.hobby-lobby.com/slowprop.htm
the most expensive prop on that page is $5.10. I'd use the prop you have for a mixing stick. Treat props like guns and knives. All guns are always loded and can shoot, all knives are sharp and will cut, and all props spin and will remove fingers and if they fly apart they will do worse.
If you insist on fixing this prop, DO NOT use it on a working modle. It would only be good for a static modle.
Old 01-28-2007, 08:55 PM
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davidfee
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Default RE: epoxy to epoxy?

Yes, that works fine. It's how molded wings are put together, for example. You should scuff the area to be bonded with sandpaper, and clean with acetone if possible. The bond will be fine.

It would be better to join the two halves when the epoxy is still uncured, but that's not always possible.

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