View single post by Vic
 Posted: Sat Jul 15th, 2017 03:56 am
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Vic



Joined: Thu Sep 14th, 2006
Location: Bronxville, New York USA
Posts: 781
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Your friend would need a VERY humid place to make plaster in the bag as you need about a quart of water for 2 1/2 pounds of dry plaster.
The issue is that dried plaster in the putty will absorb moisture and will leach (bloom) out onto the surface of the glass, allowing the possibility of mold and microorganisms to form that can damage the glass. Much like mildew forming on interior plaster walls.

https://www.usg.com/content/dam/USG_Marketing_Communications/united_states/product_promotional_materials/finished_assets/plastering-technical-guide-environmental-factors-plaster-application-en-PM10.pdf

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