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Old 06-03-10, 08:04 PM   #1
illdoittomorrow
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Question about epoxy and plastic

Silly question... does anyone know what kind of plastic the hard bottom shell of a saddle is made of, and can it be epoxied? I'd like to bond a piece of plastic to the bottom of a saddle (think Carradice hack or place to mount a light).

I've tried the search function, but can't find anything relevant.
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Old 06-03-10, 08:14 PM   #2
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I would think if you rough it up a little so there is more surface area to bond to, any heavy duty epoxy should work. I wouldnt count on anything holding to a smooth surface though.
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Old 06-03-10, 09:48 PM   #3
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I would think if you rough it up a little so there is more surface area to bond to, any heavy duty epoxy should work. I wouldnt count on anything holding to a smooth surface though.
This ^ Just use sandpaper on both surfaces, it should work fine, as long as you make sure they stay pressed together and cure completely.
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Old 06-03-10, 11:00 PM   #4
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Well, unless you used some sort of solvent cement on it, I bet it'll peel right back off. Seat base material is designed to flex, so any epoxy bond will start breaking right away.

I've had decent success with TAP Plastic's E-6000: http://www.tapplastics.com/shop/product.php?pid=129
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Old 06-03-10, 11:28 PM   #5
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Well, unless you used some sort of solvent cement on it, I bet it'll peel right back off. Seat base material is designed to flex, so any epoxy bond will start breaking right away.

I've had decent success with TAP Plastic's E-6000: http://www.tapplastics.com/shop/product.php?pid=129
There's also Shoe Goo, which is basically the same stuff, as is a brand called Goop. The nice thing is that it'll hold securely, but if you ever want to remove it, it'll come off without leaving a mark.

Most seats I've seen the bottom is made from a flexible engineering plastic. That stuff will resist nearly every type of adhesive out there, including superglues, and two part epoxies. Rubbery glues like E6000/Shoe Goo/Goop will hold that kind of plastic better than just about anything else.
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Old 06-04-10, 06:02 AM   #6
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Gorilla tape.
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Old 06-04-10, 08:41 AM   #7
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There are epoxies designed (and labeled) to work on plastic.
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Old 06-04-10, 11:16 AM   #8
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Epoxy will NOT stick to that kind of plastic.

Shop around for a different seat, or build a new seat from scratch.

Like this bike:



Here, I made a "banana seat" from scratch, using Epoxy over styrofoam, BUT notice I also replaced the seat-post with a fiberglass-over styrofoam board. So I was able to mount the seat without a sissy bar.
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Old 06-04-10, 12:46 PM   #9
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Thank you, guys! I'll try experimenting with TAP or a similar product, and if that doesn't work, I'll move on to plan B.
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Old 06-04-10, 01:11 PM   #10
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If it is ABS plastic, which it probably is, you can buy a can of ABS cement/solvent from the hardware store in the plubing section, and it can melt the pieces together. This works great on many things around the house.
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Old 06-06-10, 12:20 PM   #11
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If it is ABS plastic, which it probably is, you can buy a can of ABS cement/solvent from the hardware store in the plubing section, and it can melt the pieces together. This works great on many things around the house.

It's not ABS- ABS is fairly rigid. Bicycle seat bases need to be flexible. I bet it's polyethylene-based, but that's a WAG. Dammit, Jim, I'm a bicycle mechanic, not a chemical engineer!
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Old 06-06-10, 02:06 PM   #12
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Carradice make a metal saddlebag adapter that clamps to the saddle rails.
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Old 06-06-10, 08:17 PM   #13
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Carradice make a metal saddlebag adapter that clamps to the saddle rails.
I'll probably wind up using that or something similar- simpler than the rigamarole I had planned
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