I wanted my pattern to show on the main background and two of the other papers, so I didn't mask it until I had them adhered. Just use a little bit of washi tape to hold it down, and then spread the paste. Immediately remove the mask, and it will set in just a few minutes.
I ended up showing a few stars above and below the center block. They add a bright contrast and extra texture to the color papers and black background.
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