Sealer

[jonnyollet]

Hi there,
Looking for some advice... I have a small wooden plaque with some stuck on metal numbers (see picture).

However, the adhesive of the metal isn't great and they start to fall off (the "1" is has fallen off in the picture).
Can anyone recommend a sealer or resin to cover the numbers to seal them in - I guess in a 'plasticky' layer?
Many thanks

@jonnyollet I think you would be better with getting the numbers to stick well in the first place. Is it outside? What did you use to glue them on?