Apparently liquid cement is corrosive. I had to find out the hard way though. Yesterday I woke up at 7:30am and worked straight until 8:30pm, with my dad on our front door enclosure, putting tiles on the cement steps. When someone tells you something is corrosive after you've been touching it almost all day, you sort of automatically don't believe, because it doesn't hurt when you touch it. But afterwards, I showered and applied some Great White (industrial soap), not only were my hands cut up from the cement corrosion, there was still cement stuck to my hands. Even now, a day later, there are still bits of cement on my arms and hands, stuck!