Gillian Whittle on tue 16 mar 04
Hello all!
I have been using a plaster wedging table at a shared art studio. =
Unfortunately, it's not level and has lots of undulations in its =
surface, which is a problem, as I would like to be able to role slabs on =
it. My question is, can I add another layer of plaster on top of the =
plaster that's there? The box it's in could take another inch or so. =
Would the two layers adhere properly?
(I'm not able to start over, for various unimportant reasons which you =
will be glad I won't go into!)
Thanks in advance,
Gillian Whittle
Hope Tree Pottery
St. John's NL
ALL HAIL SNAIL!!!
John Jensen on wed 17 mar 04
In a perfect world, I'd guess this would not be the best way to go; but
I've done it and "so far so good." It would be better if you could add
more than an inch thickness. Soak the existing plaster with water until
it is saturated...then score the surface with a stiff wire brush or
other such tool. I've laid sheets of burlap into the top coat of
plaster to give it some reinforcement and added strength. I've been
using the table in a classroom situation for three years now since I did
the above procedure and it is still working.
John Jensen, Mudbug Pottery
mudbug@toadhouse.com , http://www.toadhouse.com
Charnley McCrorey on thu 18 mar 04
OK Snail is this a short enough quote?
"My question is, can I add another layer of plaster on top of the =
plaster that's there?"
Gillan, To do this successfully you will need to score the old top, good
deep scores, use a concrete/plaster glue. (follow the instructions on the glue
bottle exactly, remember you do NOT know better than the plaster people. GRIN)
this can be gotten by the quart in your local Home Depot or Lowes store. It is
about 10-12 dollars a quart
This Concrete Plaster glue will hold forever, we used it in the design
company to put gypsum on walls in places like Bathrooms that deal with a lot of
moisture.
Hope this is helpful
Charnley McCrorey
Laughing Lion Productions
"Making silly little dragons to make people smile"
Ivor and Olive Lewis on thu 18 mar 04
Dear Gillian,
The secret to getting good adhesion with repairs to plaster is to
ensure the original material is wet. I would also chip the original
surface to get a uniform rough surface that gives keys which will lock
the new layer of plaster to the old.
The reason for wetting the old plaster is to prevent capillary suction
from removing water from the new mixture. Free water is essential for
hydration of the new plaster so that crystals grow between the old and
the new. The pores in dry plaster prevent this. So the old plaster
must always be wet.
Have fun.
Best regards,
Ivor Lewis. Redhill, South Australia
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