wrote in message
ups.com...
i am trying to propagate coral and i want to make some shell grit plugs

to glue the coral on to. i know of a shop on the Gold Coast, AUS that
makes them,
but i need to know what type of glue i can use to glue the shell grit
together. it looks like a plaster of paris but that would just break
apart under water wouldn't it? any help would be appreciated.


From the GARF website;

PROJECT OF THE WEEK
Building a reef plug mold for making aragacrete reef plugs.
MATERIALS:
1 piece 2" x 12" lumber 24" long.

TOOLS:

Drill press or hand drill
1/2" wood bit
1 1/4" step bit - this bit is shaped like a sander cone with 1/8" steps.


INSTRUCTIONS:

Lay out the 2" x 12" board with holes 1" apart.
Drill pilot holes on each center mark.
Finish the holes with step bit.
Be certain the holes go all the way thru the mold.
Sand the mold smooth with 220 grit sand paper.




These molds can be made any size that easy to work with. Use wood that can
be soaked such as fir or clear pine. A drill press is the best tool for the
job. A hand drill can be used, but a simple drill guide will help you make
the holes square with the mold.




MAKING REEF PLUGS:

MATERIALS:

Carib SeaTM aragonite sand.
#3 portland cement

INSTRUCTIONS:

Presoak the mold in water for 1 hour.
Mix 5 parts Carib SeaTM aragonite sand with 1 part portland cement.
Set the mold on a smooth surface and pour in 1/2 tablespoon dry aragonite
into each hole.
Pour the aragacrete into each hole in the mold.
Let the aragacrete set for 24 hours before you push the reef plugs out.
Soak the reef plugs in white vinagar for 12 hours and rinse them in fresh
water before you use them.


--
Regards,
Alan

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