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The nail gun sounds scarey. Sorry I'm not that butch or even good with a regular hammer (wish I were)! The plaque is 14"x25" and 1-1/2" thick.

The plaque weighs around 28 pounds. Do you think the epoxy would work?

I hope you can help. I am pretty clueless about these things. I have a big serious retaining wall in the backyard and want to attach an 18 x 24 inch concrete decorative plaque to it. I am afraid of...