Is there no wiggle room on using tape?
All of the houses around here with counterweight systems use colored gaff tape as spike marks, and I don't know of any issues with locks or with the multiline. Do you have the fancy auto-locks? Maybe those are different?
Or do you have a situation where you're not moving your spike marks very often? I would imagine that even gaff tape could get gummy if left on a line for a few years.
Maybe use twill or gros grain for the more "permanent" marks (house hang), and use gaff for the one-offs? With a policy of pulling the temporary spikes as part of strike, of course.
HTH,
Jen
Spiking with ribbon goes pretty fast once you get a system down and strike goes way fast than tape. You can use a set of Vice Grips with something thick (like an old leather glove) for rope protection to unwind the rope a little and make spiking with ribbon even easier if poking the awl through isn't desirable.
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