Not a problem. Running rigging on a sailboat should be polyester, ultra high molecular weight polyethylene (Dyneema, Spectra and the like) or maybe aramid fiber (Vectran.) Dock lines can be nylon. I've never heard of an acrylic rope, or acrylic used as a rope on a sailboat. Just don't go washing your Sunbrella covers with that "Not for use with acrylic" detergent, 'cos that is acrylic fabric...In other news, I soaked all my boat's moldy, dirty, original (1974) Sampson line in a 5-gallon bucket with laundry detergent (with fabric softener!). The soap bottle distinctly said 'Not for use with acrylic.' Oops. After a few hours, with a little scrubbing, they all came about 90% clean.