View single post by BloodGlass
 Posted: Sun Jul 16th, 2017 09:43 pm
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Joined: Tue Nov 19th, 2013
Location: Monches
Posts: 35

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The old school recipe that I was taught consists of Portland cement, painters black for color, and gasoline... it makes a cement that really works into the came nice with a brush, cleans up ok with whiting and hardens to a rock pretty fast.
With that said I NEVER use this recipe... at my studio we use premade glazing putty, we use Wonder Putty, we use it straight for installs requiring glazing as intended. But we also use it for all cementing of windows, I have an old paint shaker so I mix putty with some paint thinner and a little japan dryer, shake it till it's mixed together and very soft and use a brush to putty and clean up with wood flour rather than whitening.
This gives an elastic putty, not a rock hard one. After working on hundreds of restorations with all sorts of different puttys I have some opinions based on my experiences. I will always advocate for elasticy, softer putty. It makes for more forgiving install with less break risk, it allows windows to move and flex with the structure it's installed in throughout the year. Also not least important it makes for a MUCH better situation down the road if the window needs to be repaired or even for the next guy 80years from now restoring it. If you've ever needed to dismantle or repair a window that's been actually been "cemented" without breaking anything then you know how I come to these opinions.

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