Yes, I took this up last year after seeing it at a Craft Fair, and I do have issues keeping the cells. As you say, we don't know what we'll get till it's done. I've since found a yearning to do mixed media, and began the first attempt this week. Like other hobbies it's expensive too, but am hoping that when/if I become more confident I might be able to sell some to recoup the finances. After all, how many of these crafty things can we hang on our walls and beds. I also use another medium that is thinner than Floetrol (can't remember it's name, but paint flows quicker)
Here's some of what I've done for anyone interested
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no. 4 is the only one I've kept, my DD took the other 3 not brilliant ones north to sell, or paint over.