White when you apply, and clear when ready for foil. It doesn't get any more simpler than this.
It doesn't matter if you want full coverage or to place glue in specific areas to apply foil, you'll see it before it disappears.
No uv/led light needed, just watch the magic happen.
Glue For Adhesive Foil Sticker Transfer Nail Decorations
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Item Type: foil glue
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Quantity 1
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NET WT 15ml