DIY 3D concrete + resin Background [lotsa pics]

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wow great thread. love it. i think i might look into something like this for my 150. cant wait to see it when its done
 
wow really cool mold. i did a ten gallon 3d background made of foam and concrete. do you know how long it takes for the concrete to cure?
 
I remember an episode of mythbusters where they were making model airplanes I believe out of concrete. They used a styrofoam mold and layered the concrete on. Then they used I think rubbing alcohol on the foam and dissolved it away leaving just the concrete. Has anyone tried this or think it might work? If it does dissolve the pink insulation foam that would certainly remove the buoyancy issue as long as the concrete structure is rigid enough to hold on its own.
 
wow. very nice and good job! but if i may ask, y not just go out and look for a very good looking piece of drift wood??
 
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