I am new to pen turning, approx 3 months, and have decided to make some clear acrylic pen blanks as gifts for the upcoming holidays. Unfortunately, I can't seem to properly seal the stickers or labels to the tube. My first attempt failed as the sticker adhesive lifted during casting while subsequent attempts, 5 at this point, have failed after sealing with mod podge or clear lacquer. I have allowed the sealers to cure for a minimum of 24 hours but still get blistering or crinkling effects. Any suggestions would be greatly appreciated.