Apply a little Grimas Mastix Extra to the inside of the scales/adhesive edge and allow it to dry for a few seconds.
Do the following to get the correct degree of adhesion: press the latex prostetic lightly in place and then remove it again straight away. Wait a few seconds and reposition the application, pressing the edges in place with a tissue.
Protect the eyes by closing them and covering them with a tissue. Can cause serious damage to the eyes.