Originally Posted by Omatako
I'm pretty new to this stuff so maybe the terminology I'm using is wrong.
I haven't made any sails and don't really intend to but I have done quite a bit of my own canvas work. I'm using a "bonded polyester" thread that is really strong and doesn't fray, is this standard/normal?
I have found it sometimes breaks if there were too many layers or if one layer is leather. So I bought needles that are intended for leather and have an "anvil" head or so the sewing shop called it. It cuts cleanly through multiple layers including leather and using the bonded polyester thread, it sews through just about anything.
Yes, but you DON'T want a needle that cuts (I suppose your leather needle is doing that). You want a needle that shoulders away the yarns.
And yes, bonded polyester is what you want.
Disclaimer: I am far from being an expert, everything I know is from Don Casey's books. Still, with this very limited knowledge I have churned out all kinds of canvas work and one sail so far (anchor riding sail, easy!). And, in a dire emergency, Halloween costumes for the whole family in one morning!