I would not use G.Glue to do what you want. G.Glue will expand and in the case of the cork could possibly buldge it. I use G.glue to glue cork rings together to make a grip and the expansion is more than you'd think, but in the case of making the grip that can be wiped off using Denutured Alcohol. I'd recommend Devon 2 ton epoxy which is what I use.
One further note: Devcon can be submerged in hot water and will break free. G.Glue is imperviuos to water and will not. I refrence this to the above post stating "if you ever want to remove the assembly"...........Ed