Earlier, smjmitchell wrote:

Just buy the self adhesive plastic cable
clamps from Panduit or Clip Bond.

Both are used widely in aircraft
applications. I have used them in many
applications and they are still there
years later.

I don't know about the ClickBond ones, but I have used the self-adesive
cable clamps that have the double-sticky foam tape on them. My
experience is that they consistently last only about four years of
service when applied to a painted surface that has been scuffed with
scotch-brite for better tooth adhesion. On unmolded fiberglass, they
only last about a year.

On fiberglass, I'd tend to suggest using small fiberglass cloth patches
to secure slit or drilled aluminum squares to which you can ie-wrap or
clamp the wires or whatever.

It'd be nice if glider manufacturers would build a fiberglass service
corridor into their fuselages for the inevitable wires, hoses, and
fluid lines. At least in the inaccessible portions of the aft fuselage.
That way, when it's time to change or upgrade, you simply use a string
or one of the old wires to tow the new line through the corridor.

Thanks, and best regards to all

Bob K.
http://www.hpaircraft.com/hp-24