I imagine it would be close to walking on sand; you would probably leave a small depression, but not sink. While it is liquid, it's still rock. I'll leave to someone better in physics to do the math to prove it.
I'm afraid I have to expel a rather ferocious hairball. You're on your own, girl.
Madness string 101910
Alright, I'll marry your damn tugboat if you paint it again.