Home made glazing putty failure
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catfeesh



Joined: 07 Feb 2013
Posts: 9
Location: Ontario, Canada

PostPosted: Thu May 05, 2016 9:30 pm    Post subject: Home made glazing putty failure Reply with quote

Hi there,
I made glazing putty by mixing raw linseed oil and limestone powder. After maybe 3 years of use, the putty most exposed to the sun has begun to flake and curl. The putty was allowed to cure for several months prior to window installation. The raw oil took a long time to skin over, and I chose not to use paint.
Anyone have any idea of what i did wrong?



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catfeesh



Joined: 07 Feb 2013
Posts: 9
Location: Ontario, Canada

PostPosted: Tue May 10, 2016 8:35 pm    Post subject: Reply with quote

I should clarify... My windows are behind aluminum storm windows, and although they aren't painted, i opted to use a raw linseed oil/beeswax/turpentine finish (because I hate paint).
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johnleeke
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Joined: 20 Aug 2004
Posts: 2925
Location: Portland, Maine, USA

PostPosted: Fri May 13, 2016 6:46 am    Post subject: Reply with quote

You missed two or three key points in making and using your putty:

-- the putty glazing system needs paint on it to protect it from the sun and moisture, even when there is a storm window

-- you have to drive the moisture out of the limestone powder before making the putty, this is usually done by "baking" it at a high temperature

-- to shorten the skinning over time you could use boiled linseed oil

-- the most successful putties use a powder that has a variety of specific sizes

for more on making putty, you might post your pictures and questions in this discussion:
http://historichomeworks.com/forum/viewtopic.php?t=1256

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