This stuff seals like hot glue. (I’m almost certain it is a form of colored hot glue). I definitely don’t think it will be cracking or smearing in the mail. Does not have a "waxy” feel. Just wish they were a little less pricey. Can only make 2-3 stamps per stick.Other amazon products in photos:* Valbox- 200 qty A7 envelopes craft (light kraft color)* Juvale- Japanese kraft paper (thin light beige/pink color)* Astrobrights- kraft paper (thin greyish beige paper)* Telosma- antique bronze sealing wax* Cream card stock* Rust red card stock
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