Paul,

The "rubber" liner on the underside of the engine room hatch is actually rubber formulated with a rather high content of powdered lead to help reduce vibrations.  Its significant weight makes it very difficult to keep glued to an overhead panel. I think Nick's suggestion of a two part neoprene glue is as good a place to start as any. Most one-part contact cements are going to be challenged with this application.

I suspect that Amel might still be using this lead/rubber stuff on the cockpit hatches since it is really the gold standard for sound deadening. Amel SAV might be willing to share what they use.

When I was looking at using some of this stuff for another project, the manufacturer specifically recommended NOT to use it in overhead applications because of the difficulty in glueing it down (or is that gluing it "up"?)

We are settled in to Port Louis.  Thanks for the recommendation.  Wish you were here!

Bill Kinney
SM160, Harmonie
Port Louis, Grenada