Seasoning: If you're just getting started using Boveda for guitar storage, or if you're starting with a very dry case, you can expect that the first set of packs won't last as long as subsequent packs. The reason is simple, most guitar cases have twice as much wood as your guitar does. All of that wood needs to be humidified!
We recommend seasoning your guitar case first for best results. It's the same idea and process as seasoning any wooden humidor. Simply place 4 Boveda 72% RH packs in your case and wait about 2 weeks, or until the packs become hard, whichever comes first. The moisture from the Boveda will absorb into the wood of your case and make your 49% RH Boveda packs last longer.
*Do not mix different Boveda RH levels within the same container, and do not use Boveda in the same container with other humidification products. They will fight against each other and reduce the efficiency of the Boveda.
One might expect that if you use a high RH Boveda in the same container as a lower RH Boveda that you'll achieve an environment somewhere in the middle. That is not the case, instead the moisture just transfers back and forth between the Boveda packs.