Girl Scout project - newbies need help!

Hello there!
My daughter’s scout troop is planting a butterfly garden at a municipal park. We are going to maybe make the sign for it but we are really new at this.

It will be outdoors, so I thought I’d ask the community for recommendations for materials (what to carve) as well as how to treat it to prevent decay in weather.

Please give us any tips you think would be helpful? (I am perusing the wonderful examples all over this site right now.)

Thanks in advance!

You’ll want to use a 2 color HDPE which Inventables sells.

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How big is the sign?

PVC would work great for this. It takes paint nicely. My local Lowes and Home Depot carry it.