Thanks everyone.
I don't know how long it'll keep. I imagine it'll stay for a while. I mean it's just water and the crystals are all disolved. Maybe over time it would evaporate but I think it should be usable for a while.
BTW, what a bitch it is to sand the cut aways and the edge of the lower bout, or in other words, where you can't sand in a "neck to bridge" direction and still be going with the grain. I left that for tonight. I hate having to sand from "top to back" across the thickness of the body.