help with panel writing

[ektor_s900]

Hello everyone, I have a PSR-S970, and I have seen that the dark gray or black color as the PSR-S975 that brings the panel of the fingers or sweat, the writing begins to lose, unlike silver keyboards like the PSR-3000, or PSR-S900 or PSR-S910, which did not happen so easily, would have to take a few years. So my question is, isn't there an English panel protector? On eBay I found a paste protector but in Chinese! and also volume protector.
I appreciate your comments and help

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