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I absolutely use a keyboard cover. I am very guilty of using my 11 on the couch while drinking coffee and eating. The cover has saved me from the heartache of getting coffee/crumbs into the keys.

For me, it's a necessary item.
 
I just a protector because I usually use my MBA when I'm eating :D

Don't want my oily hands leave marks all over the keyboard.
 
I use the Radtech keyboard cloth to protect the screen from keyboard marks when the MBA is closed.
 
Does the MBA still close wiyh this cloth in between?
Does it not increase the presuure on the LCD display and thus can even cause fatal damage to the LCD screen in stead of some minor scratches when not using the cloth ?

I use the Radtech keyboard cloth to protect the screen from keyboard marks when the MBA is closed.
 
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