Thread: Coroplast?
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Old 05-09-2002, 10:16 AM
impressionist2 impressionist2 is offline
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Here's the response from Ross and no-one is more surprised than I am. Didn't expect such good reactions to coroplast except the part about the ribs imprinting on the canvas in time is worrisome. Renee

Ross wrote:

"


Dear Renee,

Coroplast is a first rate material. I have talked to the company and
although they do not recommend applications or procedures, the most
common
adhesive is a heat set adhesive such as hot glue. White glues such as
Elmers is mentioned in their website but there is not much information
about
application, etc. Thermoplastic conservation adhesives might be used but
the Coroplast is heat sensitive. In their website, Coroplast lists
turpentine action on the Coroplast sheet as "slight" which may also be a
cause for concern. There are two major drawbacks. The first is the
"flute"
shape of the valleys between the core structure. As a result, it has a
"washboard" surface conformation. Conservators are concerned that
over
time, this may impart the washboard conformation to the painting. Second
is
cost. It is hard to beat the price of 1/4" plywood. Coroplast has some
advantages since it is virtually inert and light weight. Some plein air
painters use Multimedia boards as a painting support taped to a Coroplast
backing.

Have you used Coroplast as a support? How have you prepared it?

One of the most stable canvas/panel supports is a composite support of
Sunbrella fabric attached to a Lucabond aluminum panel with a
thermoset
conservation adhesive. It is made by Museum Services Corporation in
Burnsville, MN at tele: 612 895-5199.

Ross Merrill
Chief of Conservation
National Gallery of Art
Washington, DC
20565
[email protected]
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