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Well, I tried and found out. It was super fun to add the colored water to the salt, but after it dried, I had huge clumps of the colored salt fall off the cardstock. I tried it several times, and each time it didn't work. It was fun to see the salt change colors, but each time when the glue dried, it kept falling off. YES, I fail. Not every time I try something new does it work. But I didn't give up.
So I tried "What if?" again. I thought "What if I sealed it after it dried?" I thought I wonder... I wonder if I used a sealant over the glue. I tried covering it with clear fingernail polish.And guess what. It worked. It gave my flower pot such an interesting texture. I added gold paint to the pot after the fingernail polish dried.