Quoted from mystman12:What would be the easiest way to fix this? I bought a new set of boulders earlier this year, but unfortunately this sign got struck by an air ball and snapped in half. I still have my old boulder with an intact sign, but I don't have any riveting equipment or experience. I could try Scigrip, but you'd still be able to see a crack where it broke apart.
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I added a bit of clear caulking between the sign and the boulder to better support the ends of the sign. It was nearly invisible and is pretty cheap method to protect the sign.