I would hesitate to make anything concrete only 3 inches thick. Is
concrete the best material for this job? Why do you want to use
concrete? If you just want some rectangular prism shaped parts that
are heavy, consider using some scrap granite.
~~( Nehmo )~~
I guess you have never seen an old fashion laundry sink. These were only
about an inch thick.
Also consider how thick a regular old cinder bleak is.
They also make roof tiles and Hardy plank from concrete less than an inch
thick so I think the design of the item to be cast and the formula of the
concrete will make a big difference to the final useable thickness.
About the time I had mastered getting the toothpaste back in the tube, then
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