Mehron and Kryolan are water activated moist cakes. I see them used as primers for eye makeup sort of like Mac Paintpots, in reviews they are said to be comparable. I see them all the time, in random searches and more and more in blog posts and youtube mentions. So I decided to make mention of them and bring them to your attention, just in case your interested. :)

Xsparkage did a video comparison of the two brands.