Both the water knot and the various variations of the double fisherman hold well in slick ropes, but they must be tied while the line is slack. If you are doing multiple passes (around and around between each grommet and eyestrap of whatever there is to attach it to) and then frapping, a square knot should do, since the knot takes very little strain in that instance. If you take the free ends coming out of the reef knot and tuck them between the passes of the lashing with the help of a marlinspike or fid, that should keep them from flying about loose and letting the square knot come undone.
Ben
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