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Warning about Dampits!!

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Posted by Monte on August 08, 2001 at 10:53:02:

In Reply to: Re: Humidity range/control for acoustic basses posted by Stefan Willems on August 08, 2001 at 09:45:03:

: I use a Dampit in my bass (costs about 15$) and is made of a flexible green perforated tube with a kind of spongue inside which absorbs exessive humidity or add some humidity when filling it with water. The Dampit hangs in one of the f-holes. Try it, it costs almost nothing.

WARNING: Be VERY careful with dampits. Most luthiers recommend not using them for extended periods of time; they actually cause cracks. Reason: If you humidify the inside of your bass but the outside is in a dry room you have opportunity for the opposing forces to pull against and open seams or cracks. Use dampits when your bass is in the case and you are going to a gig where it may be dry, traveling, etc. Also, make sure to wring out the dampit before placing in your bass; some players shrink wrap plastic around the bottom of the dampit to avoid dripping. If you are humidifying, use a room humidifier. Ideally, humidity should be between 40-60%. Higher doesn't hurt unless it's extended time well above 60%. The biggest potential for damage is huge changes in humidity; i.e. a week of 50 degree weather in February followed by a cold spell where you run the central heat, which can often drop the humidity to well below 20%.

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