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Incorporated, a worldwide network of science museums and related institutions.
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Shellac: wonderful organic, high voc!
Now, what someone needs to find is a non voc solvent or even an exempt
solvent for lac resin. The usual formula contains either isopropyl or
ethyl alcohol as the solvent so, you've definitely got yourself a voc
based mixture. Water and shellac doesn't work out. One possibility is
India ink without the pigment.
Be careful. There are quite a few naturally occurring solvent which are
volatile and photo chemically active. Alcohols and turpenes would
produce a remarkably potent photochemical smog.
Reagan Cole, PhD
Exhibits Engineer
Museum of Life and Science
433 Murray Avenue
Durham, NC 27704
(919)220-5429 x371 (phone)
(919)220-9639 (fax)
[log in to unmask]
www.ncmls.org
-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]] On Behalf Of John Bowditch
Sent: Monday, October 08, 2007 12:05 PM
To: [log in to unmask]
Subject: Re: "Green" paint and sealant recommendations
ISEN-ASTC-L is a service of the Association of Science-Technology
Centers Incorporated, a worldwide network of science museums and related
institutions.
************************************************************************
*****
Hi Jeff,
Shellac is the miracle 19th century finish. I have used it extensively
over the years, it even works very well as lacquer for brass, giving it
a real golden color if you use the orange version. Two tips; first,
always check the shellac you use to make sure it's up to date. Old
shellac doesn't always dry properly. So paint a small area and let dry
(should dry in about 15 minutes). Second, always cut the stuff you buy
at the store 50-50 with denatured alcohol. Then be patient! You will be
applying about 10 coats in a typical application and these dry almost
instantly so you can keep going. At about 6-7 coats the magic moment
happens and the thing just glows.
As an added bonus the stuff is more or less reversible: just rub it down
with steel wool (scotch brite is actually better) saturated with alcohol
and the finish can be restored, even if it has been damaged.
John B
-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]] On Behalf Of Jeff Courtman
Sent: Monday, October 08, 2007 10:44 AM
To: [log in to unmask]
Subject: Re: "Green" paint and sealant recommendations
ISEN-ASTC-L is a service of the Association of Science-Technology
Centers Incorporated, a worldwide network of science museums and related
institutions.
************************************************************************
*****
It might be worth looking into pure shellac which dissolves in alcohol.
it is pretty durable and is easy to touch up. might also say it gives a
nice feeling to the wood as a natural finish...
Jeff Courtman
Director of Exhibit Development
Museumscapes
Office: 972.231.1002
Cell: 469.831.2256
[log in to unmask]
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For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.
Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
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