Zero stars
I agree this deserves zero stars.  What a rip off!  Not waterproof at all.  It's so soft that you can't even draw a line decent.  The tip breaks off when you sharpen it because it's a gel texture.  A lot wasted and the little I was able to use was ineffective to say the least.  I tried it multiple times thinking it was user error but it is absolutely the worst product I've ever spent my money on.  I will demand my money back!
Rating: 1 stars