I have learned a few lessons about sealing the pieces. I used Rust-Oleum Painter's Touch 2x Ultra Cover Matte Clear spray again, but I did three or four very light coats on each side, allowing the pieces to dry thoroughly between coats. Then I applied a much thinner coat of the Americana Triple Thick glaze. If I wanted a completely smooth surface, I would have applied a second coat of the glaze once the first had dried. Focusing on THIN coats of the sealing materials seems to keep the colors from bleeding.
This has been such a fun undertaking for me. My husband told me this morning that he can't believe how obsessed I've become with "taking regular sized things and making them tiny." Hahaha. So true. Be creative and enjoy!