cyanoacrylates, maybe.

Try here: Cyanoacrylate Instant Adhesives

There are also water clear epoxies that might work.

Good luck!

Thankyou LynLynch, I shall follow up your suggestions.

Regards

Gubbins

Here's one.

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WATER CLEAR OPTICALLY TRANSPARENT EPOXY

When I was doing a lot of SCUBA diving, I needed to cement glass lenses to my glass diving mask window for optical correction. I wound up using a clear silicone rubber adhesive with a primer. Worked perfectly.

Loctite makes a one-part acrylic adhesive (UV 357) that has a refractive index virtually identical to glass. It is used to repair cracked windshields and assemble compound lens assemblies.

Norland products is another.

2 part acrylic adhesives give a clear bond with Perspex sheet, never tried it with glass. What about Loctite Glass Bond? sounds like it should be made for the job.

What is the finished product?

Weatherproof implies that you might have wide ranges of temperature swings that could poosibly cause a rigid bond to fail over time due to the different rates of expansion and contraction between the bond material and the glass.

Some materials have a tendency to wick water over time and cause the clouding or delamination of the parts.

UV stability would also be a concern over time many products will yellow and break down.

A flexible bond (lamination) might be the answer.

2 part polyurethane based Safety Plus 2 manufactured by Glasslam NGI Pompano Fla is absolutly clear and suitable for exposed wet edge conditions.It will not yellow over time or break down do to UV exposure.