I made my cap stash today while I was also cleaning up the garage.
I started with an old Altoids tin. Apparently the new tins are all embossed? At least two others I had in the house were anyways.
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First I removed all the paint using sand paper and a dremel.
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I drew all the leaves by hand using a sharpy. B Wo's method probably is more duplicatable and clean, but by hand I was able to wrap them around the edges.
As with all weathered stuff, a bit of mess never hurt.
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To etch the tin I used something a bit stronger than water and electricity. I had PCB etchant solution which I used for home made PCBs. This stuff once turned a set of brand new drill bits into rusty looking nails, after I had accidently left an open container nearby.
Use gloves when handling this.
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I put the tin into the etchant solution and sloshed the solution around for about five minutes.
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The etchant took all the shine away from the metal, leaving a dull grey matte finish. It also dulled the inside of the case which helps with the weathered effect.
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The mask was cleaned off with denatured alcohol. The masked areas create a two-tone effect of shiny and dull.
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This is why I said the "Caps" label looked like sand paper. 60 grit sandpaper is perfect for the caps label.
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Add some masking tape, and the caps stash look is complete. I did have to slit the masking tape down to about 2/3rds of its normal width to make it look proportionally correct. Also, writing on sand paper is surprisingly difficult.
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Inside I stored 8 caps, 6 weathered ones, and 2 clean ones. I used some tape to hold the paper against the lid so when opened the caps are revealed immediately.