The windlass
(electric) would not grab the nylon at all.

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Dual rope/chain windlass gypsys are very sensitive to both the type and
size of nylon line just as they are sensitive to the type and size of
chain. My previous boat had a Simpson/Lawrence dual gypsy and I used a
pre-spliced rode purchased from them. It always worked fine, so I
think that if you get the right nylon rode you will be OK.