Go with BPP on this one, get the beads and forget about the solution. I myself just had gotten a bottle of solution a few weeks ago to use in a tupperdor but after experiencing how big a pain it is I just ordered the 65% beads, that way you don't have to do anything except add distilled water when too many beads turn white.

The beads are the BEST way to keep your RH at the optimum level(60-65%).