I made a couple of those back before Christmas as an experiment after hearing about water beads. Mine was just beads in a perforated soap dish, and it lasted about two months before the beads shrank to the point where they couldn't do much anymore. I keep them around still as a backup in case something should happen to my house humidifier. Good idea with the sponge, too. Should help wick the moisture out to where it can evaporate more readily.
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"You don't have to be great to start, but you have to start to be great." -Zig Ziglar
Acoustics
2013 Guild F30 Standard
2012 Yamaha LL16
2007 Seagull S12
1991 Yairi DY 50
Electrics
Epiphone Les Paul Standard
Fender Am. Standard Telecaster
Gibson ES-335
Gibson Firebird
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