Glue for air coil windings?

I want to glue the windings of an air coil. The coil is made of coated (polyurethan) copper wire.
Which is the best glue?

There is a special material called 'Q Dope' as one of the trade names. It has low RF dielectric loss.

To keep the parasitic capacitance down you should use three narrow strips of plastic running down the windings and then glue the turns to these.

I have used UHU on my FM receivers for RFin and local oscillator coils.
it is really good.
If you are in Europe it is easy to find.

Tornado

Another option is not using glue at all. For small diameter, axial air coils made with sufficiently large wire (22 gauge and larger), use appropriately sized shrink tubing around the coil bundle and slowly heat shrink it into place around the coils. It is fast, not messy, and, after the tubing's polymer hardens up after heating is surprisingly immune to damage.