FWIW my building floor is on about a foot of compacted bank run gravel.The slab is 7.5 inches thick with 3/4" rebar every 12 inches .I had the whole thing poured and finished for around 900 bucks .It was over 5 grand worth of concrete at the time .
Sounds like over kill perhaps but I got the...
About the finish .What you don't want is a mirror like finish because with a little bit of water it becomes about like ice .Smooth not like a mirror .
I use sealer myself .Unless epoxy has came down in price it used to be about half the price of the concrete .
About the cracking .All crete...
If you don't block up the mesh,"pull the wire " .In other words hook it with something and pull it up into the slab .It does no good in the bottom of the pour .I'm a rebar kind of guy myself .
A word,hire a finisher .Anybody can rake concrete with a "come along " but a good finisher is worth...
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