I would think you would be okay, we have people in the area that make boat covers out of nylon, ofcourse were in ohio and takes years to really degrade but depends on what the customer is scrubbing their cover with. you should be fine IMO

Thanks Adam, unfortunately that's one point for my wife. I hate it when she's right, haha

Throw away any organic thread and live worry free!

I agree with Kevin. I have nothing but poly just for that reason, and I don't even do a lot of boat work. But it'd be my luck that this would happen. And yeah alot depends on what they're using to clean with but also just how much it sits in the sun uncovered. I have a local shop that I'm friends with and one of his customers came to me asking me to restitch all of the seams that this other shop did a few yrs before cause every year since it had been done a couple cushions needed restitched and the customer felt the other shop was incompetent. After talking with the other shop owner, he confirmed that he had never used poly in all of his years(over 30 yrs) and had never had this issue. Turns out the customer is constantly cleaning the cushions trying to erase the orange stains from his spray on tan and the boat is ALWAYS in the sun at the dock uncovered. So probably a combination of not poly thread, constant sun and excessive harsh cleaners. But I still use the poly to try to avoid such possible situations.

If I wanted to look into poly-thread and learn more what is a great place to start?

Sungaurd Bonded Polyester UV, Serabond bonded polyester (Amann), Eddington Bonded Polyester. Dabond…

Then theres Solarfix, Tenera Gore-Tex….

I do a lot of marine upholstery and canvas. I always use Bonded UVR Polyester thread… size 92 for upholstery and size 138 for canvas. If the customer is paying extra I get the Tenera. But I love the job security of using Bonded polyester when the customer comes back 5-10+yrs later for a restitch on canvas. Gives me a chance to up-sell new canvas or something else. I never have to do restitching on upholstery and I’d prolly never do it.. just replace.