One brief addition to my previous post.  The incorporation of flake aluminum 
pigment in B-72 would probably raise its vapor barrier properties to nearly 
the same as shellac with aluminum if used in three thickish coats.

Marc

American Conservation Consortium, Ltd.
     4 Rockville Road
     Broad Brook, CT 06016
     www.conservator.com
     860-386-6058

*Collections Preservation Consultation
*Conservation Assessments & Surveys
*Environmental Monitoring & Low-Tech Control
*Moisture Management Solutions
*Collections in Historic Structures
*Collections Care Grant Preparation
*Conservation Treatment of:
     Furniture
     Painted Wood
     Horse-Drawn Vehicles
     Architectural Interiors

Marc A. Williams, President
     MS in Art Conservation, Winterthur Museum Program
     Former Chief Wooden Object Conservator, Smithsonian Institution
     Fellow, American Institute for Conservation (AIC)


----- Original Message ----- 
From: "Dan Bartlett" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, September 19, 2007 8:56 AM
Subject: -- Spam --[MUSEUM-L] B72 as Vapor Barrier


> Hey all:
>
> Will B-72 act as a vapor barrier?  I need to drive some screws through the 
> laminate inside a sealed exhibit case.  I'd like to seal the recesses with 
> 2-3 coats of B-72.
>
> Thanks,
>
> Dan
>
> -- 
> Dan Bartlett, BFA, MA
> Curator of Exhibits
> Midway Village & Museum Center
> Rockford, IL
>
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