Properly prepare the surface. Base-coat with one
or two coats of Off White AquaBond or oil-base primer; let dry.
Dilute the SandStone with 10-20 percent water for
easy rolling. Apply a thin coat of SandStone, covering the
entire surface; let dry.
Lightly scrape the dried SandStone with a trowel
to knock off any roughness; dust off.
Skim-coat PlasterTex onto the surface using a
Whizz fabric roller. Allow the PlasterTex to set up for five to
10 minutes and then compress it into the substrate with a
stainless-steel trowel. Allow to dry for at least one hour.
Create a crumb mixture by combining 4 parts
SandStone with 1/2 part Lime Slag.
Randomly add more PlasterTex to the surface using
the trowel, skipping around over the surface and building it up
thicker in some areas. While the plaster is still wet, apply the
crumbs by either "throwing" them onto the wet surface, or by
putting them on the trowel and compressing them into the
plaster, opposite right.
Knock down the materials but do not smooth out
the crumbs and texture completely; leave some areas thicker and
more crumbly than others. Cracks will occur where the plaster is
left heavy. Let dry overnight.
Create a custom warm brown glaze by combining 2
cups of AquaCreme, 4 tablespoons of Earth Brown AquaColor, and 4
teaspoons of Autumn Brown AquaColor.
Knock off any loose crumbs or plaster and sand
the surface with 220-grit sandpaper; dust off. Mist the surface
with a thin film of water. Apply a coat of the warm brown glaze
to the surface using a synthetic stippling brush, below, working
it into all the cracks and crevices. Lightly dry-rub with a
terry-cloth shop towel to remove any tool marks and excess
glaze; let dry.