B.t.w. i found that nail polish (looking at that bottle in your piccies) is a good preserver of outdoor prints, just get the stuff all over it let it dry and no moist will get to the components or pcb.
Larger pcb's i spray just like my alu antenna's with clear coat tectyl ment for protecting chrome ( bumpers) in winter.
Colorless just like lacquer but much more resilliant outside.