Has anyone ever used any sprays or paints to protect the cabinet of a speaker?


I bought a pair of JBL Studio 530s that sound phenomenal outside.  Although they are covered by a patio, there is still atmospheric moisture in the air at night when I listen and I would like to protect the cabinets from that moisture.   Suggestions please.  Let 'er rip. 

Thanks!
shtinkydog
Loomis, that's really amazing.  I don't expect mine to last more than 5 years if I did what you did.  The summer sun we get is brutal for about 4 hours where i usually have them.  But good to know.  
Erik, per your suggestion, I found just the ticket.  Rustoleum has a clear urethane with UV.  I thought you were joking about the UV.  So yeah, I sprayed them puppies over the weekend.  They look much darker now, and cooler!  Thanks, man!