Post #82075 by Traderpup on Sun, Mar 21, 2004 10:01 PM

Concrete mixing can get to be quite a science. For vertical surfaces, you want to get the mix to just the consistency that it will hold its shape when a trowel is dragged thru it, but is still wet and spreadable, like canned cake frosting. Also be sure to let regular concrete & stucco sit after mixing for 15-20 minutes before you start to work with it.

For texture, experiment with different mix ins that will dissolve or quickly break down. Rock salt works well; ice cubes tend to melt too quickly and dilute the concrete, creating muddy pockets. I've had luck with things like croutons. Try spreading out rock salt in a thick layer, spray lightly with water to get it to all stick together, allow to dry, and break into chunks for a heavier mix in.

I haven't done any faux lava rock in years, but regular rock salt & the homemade chunky rock salt always seemed to work the best.

There's lots of color additives for concrete... its nice to tint the actual concrete mix & just accent with paint. Then you won't have to worry so much about touching up chips & fading paint.

[ Edited by: Traderpup on 2004-03-21 22:04 ]