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Refurbish an E-Piano: Fix and Polish Broken Keys

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Approximately year ago I decided to learn to play the piano. After I first practised on a small keyboard for a while, I decided to buy an e-piano from ebay. I bought a used Kawai CL20.

The description of the piano was great and the price ok. However, after I picked it up at the owner and came home, I realized that the description of the state of the piano was not completely true:

  • 4 of the keys were hanging down 0.1 inches and did not make a proper sound. 
  • all of the keys apparently had an ugly incident with some kind of aggressive cleaning agent, because their shiny surface had lots of dim areas that looked like stains.
I was very disappointed until my boyfriend suggested to open the piano and fix it myself. That way I would really own it afterwards :). I searched the internet for tutorials but i could not find a lot of useful things, so I hope I can make the life easier for anyone who wants to fix their e-piano.
 
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Step 1: What You Need (Apart from a Looooot of Patience)

Picture of What You Need (Apart from a Looooot of Patience)
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Initially I wanted to buy new keys and just replace them by myself. But I quickly realized that new keys would cost twice as much as I paid for the whole piano, so I asked several piano restoring professionals how to deal with the problem of these ugly surfaces of the keys.

They all suggested polishing with car polish or something similar! So I went to a DIY store and finally bought a "repair set" for acrylic bath tubs. The set contained sand paper ranging from 400 to 1200. ( I am not sure if you have the same classification of sand paper in the US, for us 1200 is really super fine, it's pretty much the smallest grains you can get). Furthermore, the set contained a polishing paste and a polishing towel.

Additionally, I also bought a "sand towel" with 1500 graining which is the finest sanding available. 

I also bought a fixture for a round plate and a lamb wool towel to put onto the fixture. The whole thing could then be attached to the drilling machine.

In addition, I also bought PTFE paste (teflon / silicone paste) to lubricate the moveing parts of the keys again after I removed them and put them back.

Apart from that, you need a drilling machine, screwdrivers, a loooot of time and a room where you can store all the removed keys and the rest of the piano pieces.
TheManse10 months ago
Looks nice and clean again! Well done!
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