Could someone let me know what would be the best mirror adhesive for:

1. A 174 cm x 81cm acyrlic mirror (3mm) to be attached vertically to a plastic/perspects board in the garden; and

2. A 150cm x 90cm (6mm) normal glass mirror with silver backing to be attached vertically to vaults in a basement.

For a variety of reasons, neither of these can be drilled.

Many thanks for your advice and tips on both product and approach!

Havego