What material can i put on metal bottlecaps so i can paint them with gouache?

i am trying to make pins using recycled materials and i don't want to use acrylic much or at all, i was thinking gesso but that's usually used to make surfaces less porous so it might not work on an already non porous surface.

if anyone has any ideas please share

tia

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u/Prestigious_Fish2331 — 2 days ago
▲ 18 r/dippens+1 crossposts

Purchased these at my local creative reuse store, anyone know where i can purchase a compatible handle?

there's six of them, the bottoms are shaped kinda like this: [

I'd love to use them but my handle is round like the letter c

u/Prestigious_Fish2331 — 4 days ago
▲ 199 r/turtle

Turtle Princess enjoying the sunshine on his dock

he's my whole world. i love seeing him so safe and peaceful. all photos taken this past month

u/Prestigious_Fish2331 — 8 days ago
▲ 11 r/turtle

turtle i spotted in the river

seems like a ladie to me, this photo was taken from a footbridge on my nikon d3300

u/Prestigious_Fish2331 — 9 days ago