My daughter graduated from Purdue so I wanted to make her a bookmark based on the colors of the Purdue t-shirt she has (Yellow & black). I put the word PURDUE down the bookmark, did the tooling and it was time to dye/paint. I painted the letters yellow, let dry, put Block Out on the letters, let dry, then wanted to dye the background black. Well, the block out didn't work, the black dye got all over the letters. Any suggestions?