How to protect graphics on the walls of the house in the Maritime environment?

[mihailovoh]

[QUOTE=Пряник;3355541]Probably place the leaf between two panes of glass and glue them along the contour will be even more reliably.
No air - no steam and condensate@
When it was required to decapsulate old-expensive sheet.Asked ecomical.a few minutes turned the glass block was even proposed to make vacum in the glass block.
But mostly under the glass.the back of the plywood.Passepartout, not colored cardboard.sealed with silicone sealant.