Kevlar is a funny one for me as I’m now allergic to it. Yay occupational disease! If I have to use it for a quick job it’s fine, but anything longer than an hour I get what feels like a sunburn. Usually on my arms and cheeks, basically where I touch when I push up my sleeves or whatnot. Doesn’t get red, just feels like a bad sunburn. One of the ways it’s used is in big rolls with an adhesive backing, for patches. So we’re not really sure if it’s the Kevlar or the adhesive, but I can use any other product with an adhesive back and it doesn’t happen.
Anyhoo, Kevlar is really tough, so it can be a pain to cut. That toughness makes it great for backing patches or chafe patches. On Genoas we’d use it to make spreader patches. It’s really only used like that on laminate sails. Though I’ve seen Kevlar leech line used on Dacron sails. Another common use is in kayak hulls along the keel for abrasion resistance. It also has a very high melting point and will char more than melt, which also helps with chafe. Its UV resistance isn’t the best so it will deteriorate over time. But racing sails don’t last as long as cruising sails so it evens out. You can recognize it on a sail as it’s a golden yellow.
Edit: I think it’s fallen out of favour over fibers like dyneema and carbon. I haven’t been in that part of the industry in a long time.
The fibers and technology in racing sails are pretty crazy. There’s some neat videos online if you want to dive a bit deeper into it.
A kevlar allergy is definitely an interesting one!
I gotta ask what you mean by patches. Judging by the fact you seem to mostly work on racing ships and other very expensive sailing ships, I’m guessing you don’t mean patches in the sense of filler material to fix holes?
Well, kinda. Imagine there’s a tear in the sail, you’d put a patch on it. And on a laminate, or plastic, sail it would be like a big sticker. Or if there is a place where you know something is going to rub constantly, you’d put a chafe patch. And as laminates aren’t very strong when they’re punctured, like with a sewing needle, you’d put reinforcing patches under whatever you want to sew down.
Tbh, I haven’t worked with laminate sails in a long time. I did service and repair work in my shop mostly, for regular sailors. Honestly I used to get a fair bit of work from the bigger lofts where small repair work wasn’t worth it for them to do. And really, these sails aren’t just for big fancy race boats, any sailing club with racers (which is pretty much all of them) will have people with laminate sails. The general public only sees the big races, like the americas cup or vendee globe, but every Wednesday night around the world, there’s regular people out racing.
Thanks a ton for the answers!
I’m honestly unsure where my brain got the knife thing if I’m being honest.
One more question for you if you don’t mind -
How’s kevlar to work with?
Haha, my brain does the same thing all the time.
Kevlar is a funny one for me as I’m now allergic to it. Yay occupational disease! If I have to use it for a quick job it’s fine, but anything longer than an hour I get what feels like a sunburn. Usually on my arms and cheeks, basically where I touch when I push up my sleeves or whatnot. Doesn’t get red, just feels like a bad sunburn. One of the ways it’s used is in big rolls with an adhesive backing, for patches. So we’re not really sure if it’s the Kevlar or the adhesive, but I can use any other product with an adhesive back and it doesn’t happen.
Anyhoo, Kevlar is really tough, so it can be a pain to cut. That toughness makes it great for backing patches or chafe patches. On Genoas we’d use it to make spreader patches. It’s really only used like that on laminate sails. Though I’ve seen Kevlar leech line used on Dacron sails. Another common use is in kayak hulls along the keel for abrasion resistance. It also has a very high melting point and will char more than melt, which also helps with chafe. Its UV resistance isn’t the best so it will deteriorate over time. But racing sails don’t last as long as cruising sails so it evens out. You can recognize it on a sail as it’s a golden yellow.
Edit: I think it’s fallen out of favour over fibers like dyneema and carbon. I haven’t been in that part of the industry in a long time.
The fibers and technology in racing sails are pretty crazy. There’s some neat videos online if you want to dive a bit deeper into it.
A kevlar allergy is definitely an interesting one!
I gotta ask what you mean by patches. Judging by the fact you seem to mostly work on racing ships and other very expensive sailing ships, I’m guessing you don’t mean patches in the sense of filler material to fix holes?
Well, kinda. Imagine there’s a tear in the sail, you’d put a patch on it. And on a laminate, or plastic, sail it would be like a big sticker. Or if there is a place where you know something is going to rub constantly, you’d put a chafe patch. And as laminates aren’t very strong when they’re punctured, like with a sewing needle, you’d put reinforcing patches under whatever you want to sew down.
Tbh, I haven’t worked with laminate sails in a long time. I did service and repair work in my shop mostly, for regular sailors. Honestly I used to get a fair bit of work from the bigger lofts where small repair work wasn’t worth it for them to do. And really, these sails aren’t just for big fancy race boats, any sailing club with racers (which is pretty much all of them) will have people with laminate sails. The general public only sees the big races, like the americas cup or vendee globe, but every Wednesday night around the world, there’s regular people out racing.