Hi Kat!
Welcome!
When I mail mine, I usually turn the card inside out or add a piece of cardstock to protect it. If it has rhinestones, etc, I also add packing tape over that area on the outside of the envelope and that seems to help them go through the machines without getting destroyed.
A triptych is a 3 panel creation - that term is borrowed from fine art and religious art.
I've never had my stamps lose their sticky - cling foam works forever, and clear stamps can be cleaned with rubbing alcohol if they're dirty and they cling as good as new.
No such thing as a silly question, girl. We've all got a million of them
