Jacek A. Rochacki wrote:May I ask about this water/propylene glycol solution: what are the proportions of water and this propylene glycol ? I ask in public forum because I think that it may be of good use for some/many of us. Thank you !
I got the idea from Bacsidoan on this forum. You can buy propylene glycol for about $13.99 online. I like using it because it has prevented mold from growing on my sponges. It also keeps the guitar from being over humidified because the PG absorbs excess moisture, which also allows the sponge to last longer before needing to be recharged with water.
In theory you're supposed to do a 4:1 ratio (4 parts PG and 1 part water) to keep the relative humidity around 55%. Once the RH goes beyond 55%, the propylene glycol starts absorbing the excess moisture so you don't over humidify your guitar. Now if you use less PG and more water, like a 2:1 ratio for example, then in theory the RH cap will be higher than 55%.
In my experience though, I've just been doing a 1:1 ratio and it still seems to keep the RH at around 50-55% even without using the d'addario humidipaks. I prefer a 1:1 solution because its easier to measure, and makes things less sticky. And if ever, I'd rather slightly over humidify then under humidify.
Important note: You only need to use the PG/Water solution once. Once the sponge gets dry after that, you only have to add water from then on, unless you wash the PG out of the sponge of course.
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