Hiding aggregate in concrete pour

[S Rated]

I'm unable to find any information pertaining to "floating" concrete
when it is poured into a form. My ultimate goal is to hide all coarse
aggregate from all surfaces when poured into a mold. I plan to use
melamine surface for the mold.

So far, I've come up with two alternatives: Only use sand as
aggregate and option two is to pour standard concrete mix and then
after braking mold, cover all surfaces with mortar mix. While I plan
to have a rebar skeleton, I'm unsure of sand-only concrete strength.
And option two is not ideal as I'd like to bypass additional steps
post mold braking, if possible.

What I'm making are table legs that will be about 6"x3"x40". Surface
finish I'm looking for is similar to this --
http://www.cgmprecast.com/images/picnic_table_leg.jpg. If this
should be posted to a different group, please suggest where.

TIA,
Dennis