I replace my north center depower line with engine starter rope , last three times as long I have noticed

Sailkote is OK and easy to apply to the depower line but I prefer soaking the line in molten candle wax

works fine with the cleat, its the same material used on the north kites already just a tighter weave , doesnt stretch , when it does finally wear it has an internal rope so that if it snaps the outside weave your not floating out the back with a down kite as the internal rope still holds, only thing different is that the tighter weave makes it a little more rigid which i prefer anyhow so works for me.

doesnt seem to it more just gets worked into the rope and then it just seems to make it slide a little easier and wears the rope (and the bar) out less. having said that some people wear the ropes out VERY quickly while riding in the surf hooked in.