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Step 4.
Before adding the remaining plaster, spray
your mold with the release agent (or cooking spray). Spray it evenly without
allowing it to puddle too much in the recesses. I tend to hold my sprayer
about 6 inches away from the mold so that I get a nice light coat that goes
on smoothly and evenly.
Step 5.
Add the remaining powdered plaster of paris
to the water a little at a time, stiring briskly with your whisk until it's
nice and smooth. (Not pictured).
Step 6.
Gently pour the plaster mixture in to the
center of the mold. Once it is filled to the top, lift the mold up off the
surface and tap it back down gently to bring any air bubbles to the surface.
I try not to "over fill" the mold if I can
help it.
Step 7.
Use your squeegee to level off
the plaster. This will give you a nice flat back on your plaster piece. It's
not absolutely necessary, but I like doing it to ensure a good piece. You
can also use the flat edge of a piece of cardboard or any other flat edged
item.
Step 8.
Give the plaster time to set up. About 30-45
minutes is typically necessary for your plaster to set up good and hard. You
will find that the plaster actually heats up as it is setting up. As long as
it's still warm to the touch, it is NOT ready! If you remove your piece from
the mold before it has completely hardened, it will break and you will have
wasted your time.
If you would like to "hang" your plaster
pieces instead of mount them to your walls with joint compound, simply
fashion a little wire hanger (make a "U" shape with fishhook ends") and
insert it in to the back of the plaster while it is still wet and it will
dry good and solid in there.
Step 9.
Turn the mold over and lightly press on it's
front until the mold "pops out". Sometimes you have to gently work at it a
little bit, but as you use your mold over and over, it will become easier to
take the pieces out and in many case, they will simply "fall" out so be
careful not to hold them over the floor so that they drop and break.
Step 10.
If you have sort of a "rough" edge around the
piece, simply take the edge of a sharp knife, fingernail file or similar
object and scrape it smooth. This is VERY easy to do while the piece is
fresh out of the mold because it hasn't totally dried super hard yet.
You can apply your piece to the wall right
after it comes out of the mold, but handle it with care since it will take
another 24-48 hours for it to become rock hard and bright white in color.
It's weight will also change to become much lighter as all of the water
evaporates.
If you click on the photo to enlarge it, you
will see a small "hole" where the plaster was "thin" in that area. This
means that my mold was not fully filled or that it might not have been level
at the time that I poured it.
No fear! This won't be a bother since when I
apply to the wall, (or furniture, etc) the back will be covered with joint
compound and the hole will disappear.
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