Here is some info I found in another forum, and how I used it:
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Sodium hydroxide (NaOH, lye) solution works great to dissolve the red glue without harming the plastic. Here's my technique.
WEAR SAFETY GOGGLES. Even dilute NaOH can permanently damage your eyes.
The sodium hydroxide I like to use is granular NaOH, which I've bought on eBay. If you can get Red Devil lye or some other pelletized NaOH at your hardware store, that will work too, but the granular NaOH dissolves faster.
In a plastic bucket, mix 80 grams NaOH with 2 liters of water until all the NaOH is dissolved. (The bucket will get warm.) Be careful not to splash any of the solution on yourself. If you do, wash it off promptly with a lot of water.
[For you chemistry types, this recipe makes a 1-molar (1 mole/L) solution of sodium hydroxide.]
Immerse the keys in the lye solution. You only need to soak the part with the glue on it, so don't worry if the narrow parts of the keys aren't bathed in the solution.
Leave the keys soaking in the solution for 18-24 hours. After this time, no traces of the red glue should remain, and the weights will simply fall out of the keys into the bucket.
Carefully pour the NaOH solution down the drain. Don't let the weights get poured down the drain too.
Rinse everything with a lot of water. Dry the weights as best you can. It's normal for a bit of rust-colored oxidation to form on the weights.
I like to let the keys soak another 24 hours in a bucket of soapy water. This bath helps eliminate the fishy odor left on the keys by the reaction of the lye solution with the red glue.
When everything is dry and clean, re-glue the weights into the keys. I have had great results using a popsicle stick to apply a dab of 5-minute epoxy to each key. Make sure the weights are properly centered.
The best way to get red glue off the metal chassis is to blast it with freeze spray, then, while the stuff is frozen hard and brittle, chip it off with a single-edged razor blade.
And that's it. Have fun.
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I used a bubbler (a simple type of pump) to keep the lye solution moving and wah the glue out of the keys. I simply took a scrap of 3/4" PVC pipe just long enough that it will sit in the bucket from one corner in the bottom to a point below but near the top of the liquid on the other side. I put a piece of aquarium air tubing though a hole in the side of the pipe near the bottom, and curved it toward the upper end. when air is pumped through the tube into the pipe, the bubbles rise through the pipe and pull the solution along, creating a general circulation in the bucket.
I wanted to have plenty of solution to soak all the keys, so I mixed up the entire 1 lb container from the hardware store in the same concentration as above: 80 grams NaOH to 2 liters of water is the same concentration as 1 Lb NaOH to 6 quarts of water. Do your homework and read up on the web how to mix the lye and water, and how much heat is generated when mixed. This is a very powerful chemical!
Pay attention to all the safety warnings above, and enjoy your rehabilitated keyboard!
quote from this forum: http://www.gearslutz.com/board/electron ... -glue.html