The only cones of gutterman's thread they have at my Joann's is nylon serger overlock thread... not really useful for anything else... maybe that's what you have...
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I did some break tests with an unexpected result. I alternated snapping Gutterman and some Coats & Clark I picked up at Walmart. Both were polyester and I did enough snapping to make my hands sore and use up several yards of each type of thread. The Gutterman has a nicer appearance, smooth and little or any fuzz. The C&C is pretty generic looking and a little fuzzy. However, after snapping a lot of thread I had to come to the conclusion that the plain old generic C&C was slightly stronger than the Gutterman. I think the Gutterman quality control is probably better and there would be less variability between each lot of thread than with the C&C, but I found the results to be very surprising. I really expected the Gutterman to be noticeably stronger and that was not the case.
That has to be it. I'm definitely not going to use it. Since I needed to order some sil for a tarp (man these projects are addicting!) I went ahead and played it safe and ordered some Gutermann Mara 70 and Tera 40 from Scott. I think I'll just wait to do any sewing until that arrives.
Someone needs to try this stuff out...
http://www.countycomm.com/KEVLAR.htm
Oh wait, they also have SPECTRA Sewing Thread too!
http://www.countycomm.com/spectra.htm
It's gotta be good, right?
I have no doubt someone uses kevlar and spectra thread to good advantage. But I don't see the need for it gear making. First off... I don't want to run a rasp through my machine. Why would I want to use thread that is stronger than the materials the tension plates are made out of? Secondly... I am of the opinion that you stitching should be the weakest link in the chain. Please I did not say it should be weak. I said it should be the weakest link. I would rather have a few stitches snap than have the fabric tear out in the back. One you can fix with a small sewing kit. The second... who knows.