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Topic: Polyester and waterproof  (Read 655 times)
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Pinkguin
« on: October 08, 2008 08:47:04 AM »

Hey craftsters,

I was at the fabric store this afternoon (there was a 20% sale on all items!!) found this amazing cloth that's begging to be made into a raincoat. All the tag said was: 100% polyester. I'm not sure if it is made to be waterproof. Is the raincoat still possible to be made? Will the rain seep through the polyester cloth? I'm thinking of lining the cloth with a layer of plain cotton or perhaps calico. Help please! Any ideas?

Pinkguin

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SpottedFrog
« Reply #1 on: October 08, 2008 09:17:54 AM »

Test a swatch?
Most raincoats fall into one of these categories:

water repellant treated Nylon or polyester or poly blend (like a typical man's trench coat)
Vinyl coated cotton (your shiny cute print kid raincoats)
Rubberized cotton (like a real Mackintosh)

None are machine washable. If the fabric info on the end of the bolt didn't mention any of these qualities it's probably not water repellant. Now, some tightly woven polyesters are fairly resistant, but will eventually soak through, but would be fine fo a brief light shower or heavy fog type situation. How much rain do you walk in? Cheesy
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mom2blu
« Reply #2 on: October 08, 2008 09:40:41 AM »

I'm not sure how to tell if it is waterproof (besides testing some) but I once, years ago, saw a thing where they took some type of flexibile vinyl varnish like stuff to waterproof something similar. They made the item and brushed on this weird sealer. I'm not sure what the sealer was, or if you can actually find it anywhere but I thought I'd suggest the idea.
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« Reply #3 on: October 08, 2008 01:07:14 PM »

I had a coat once, and I've never been certain, but I was fairly sure it had three layers.  A dense, water-resistant (though not repellant) polyester, and the inner lining was a soft knit, but it always felt like there was a third, more structured layer in between, and I wonder if that wasn't water repellant?  I don't know about constructing coats with three layers, but it may be a possibility?
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Pinkguin
« Reply #4 on: December 04, 2008 07:35:23 AM »

Hi all, thanks for your input! I'm thinking of buying those cheap "disposable" raincoats to be the middle layer, so rain won't soak through. I'm not sure if the craft store sells the sealers, but will check it out once i've got the time! Thanks again! Cheesy
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« Reply #5 on: December 04, 2008 02:23:46 PM »

reading your title reminded me of an experiment i have been meaning to try. fusing plastic, but one or thing layer of it onto a cotton or some sort of fabric that goes well with it.... sorta like interfacing? donno
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SpottedFrog
« Reply #6 on: December 04, 2008 03:34:00 PM »

They make a vinyl that's designed to be ironed on to cotton that will give you a waterproof surface. One brand is Therm-O-Web Iron On Vinyl. It's stocked in the same area as innerfacing and fusibles.

Important note: most vinyl & plastics don't tolerate heat well, they melt or burn instead of bonding, the product I mentioned was designed to be heat bonded and you can screw up pretty bad if you use a too hot iron. You can also burn yourself pretty bad even if you do it right. It's best used with cotton because cotton tolerates heat better than man made fibers (polyester, nylon, etc.). You don't want the fabric you are trying to waterproof to melt or burn either.
I have used it with moderate success. It looked & wore well as a liner for a makeup bag, it didn't take the abuse of being a lunch tote.
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