On Tue, 16 Aug 2005 04:13:43 -0400, Roger
wrote:

On 15 Aug 2005 22:34:35 -0700, wrote:

We put in a concrete hangar floor and the finish is less than
desirable. There are patches where it's recessed (about 1/8"- 1/4"
recessed and rough) and then other areas where it's rough and proud
(about 1/8") with swirl marks.

Is there anything we can do to mechanically smooth this? Do they make
a big sander for concrete and how well does it work?

Is there anything we can do about the low spots or do we just knock off
the high spots and then not do anything about the low spots?

This is a new hangar floor (a couple months old) that hasn't had any
oils, etc on it yet.

We were hoping to level/smooth it pretty nice and then put some sort of
paint or sealer on it so that we could use a dust mop instead of a
broom . Recommendations on the best smooth sealer for the money
(knowing that it's a new floor and won't have oils, etc in it yet)?

Some one must make the equivalent of a sander or grinder for the rough
surface but I've never seen one.


There is. It's called a Terrazo grinder. Or is it terazzo.No, it's
Terrazzo. Anyway - it does exist. Terco and Oztec are two names.
Check local concrete and flooring contractors - most of the good ones
around here are either Italian or Portugese.

I have four coats of the two part epoxy garage floor coating sold by
Lowe's on all but one end of the shop which has three coats with the
top coat sanded. The four coats are like a mirror.. It's a name brand
but I've forgotten which. I still have two gallons some where out in
the shop so I could look it up.

Even for a new, clean floor you acid etch and wash the concrete.
A power washer is nice for that.
You mix it, let it set for a few minutes and then roll it on with a
paint roller. The solvents are nasty and flammable (more like ether
fumes). I'd suggest a full hood breathing apparatus.

The stuff works great. Fills well and is durable.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com