: My only concern is that they tend to get brittle over time and as was
: previously mentioned, in the cold.

Jim and Brian

For guides for rudder control lines you could use even smaller wire ties. And they are very easy to replace when varnishing or if they get brittle. It is probably wise to sand the part that has contact with the glue because of the polyethyl..?? and it's ability to react with epoxy.
Thanks for the comments

Petter