In response to concerns about the durability of beer cans, I've added a fire-resistant DIY alternative for safeguarding your seed phrases: stamping them on stainless steel dog tags with a screwdriver, see https://bitcan.world/#durable_setup
Discussion
Please don't re-invent the wheel. Just use stainless steel washers. It's very safe and very cost effective solution.
https://github.com/minibolt-guide/minibolt/blob/main/bonus/bitcoin/safu-ninja.md