I don't use a screen protector for my KT, but I keep it in a case when I'm not using it.
Where did you look for a screen protector? There's a huge selection on Amazon and Ebay. Here's a few:
Here
Here
Here
And one from Zagg for the K4 touch, which is probably the same size.
p.s I don't own any of these screen protectors so I can't say how good they are.