I found out that using marbo gum from Pro-Chem doesn't work with Jo Fitsell's marbling technique. When the fabric dried, the marbo gum made a plastic like coating that didn't wash out. I even tried washing it in the washing machine and it still didn't come out. It's flaking off now but the paint is coming off with it. I will be sticking with the methyl cel for this technique. Eventually I should be able to get this off and reuse the fabric or marble on the other side. I'm glad I didn't try marbo gum first or I might not have tried again with the methyl cel.
You can see how shiny the coating is.