![]() Scott’s Rating (1-10): 10 Sarco Dual Glaze The putty is easy to tool, cures quickly in 2-3 days, and can be used on steel windows, as well as for in-situ glazing, making it the most versatile putty on the market today. Glazing windows in the humid southern US we struggled for years to keep mildew off our putty (a common issue) and after 3 years of development we found a formula that worked. This putty is essentially Sarco Type-M putty with the addition of non-toxic, mildew inhibitors. I partnered with the Sarco Putty Company to formulate this putty years ago to meet my exacting specifications. This is my personal favorite glazing putty. Scott’s Rating (1-10): 9 Austin’s Glaziers Putty Despite this, I have had decent success using it sparingly outside as long as I get it painted in the 3-5 day range after application. ![]() It is only for wood sash (not for steel windows). It is only recommended for glazing in a shop, which simply means it must be painted prior to be exposed to sun and weather. The putty is also fast to skin over, which means it is ready for paint (in most conditions) in as quick as 3-4 days. It is relatively easy to use, not too oily, or too dry and tools to a nice smooth finish. This is the most common glazing putty that professional window restorers use. To rate a glazing putty you need to look at the following characteristics.īelow I have listed some of the most popular putties available today and given you a description of each as well as a combined rating based on my experience working with each. This is a tough question because it’s largely a matter of personal preference, but there are some characteristics, undoubtedly, that make for a quality glazing putty. The corners of the putty are tooled into a mitred joint which gives the look of wood joints.Īfter several weeks or days, depending on the glazing being used, the putty has cured enough to be painted and sealed against the weather which extends its life and protects it from the elements. The excess putty was then scraped away and the glass was secured in place with small metal tabs called glazing points which came in a variety of sizes and shapes.Ĭlean, mitred corners on fresh glazing puttyĪfter the glazing points were installed the face of the glass was puttied and tooled to a smooth beveled surface that seals the glass and allows water to shed easily off the surface. Though putty application had slight regional differences, the general best practices were to apply a bed of putty into the glazing rabbets prior to installing the glass which was then pressed into the putty creating an excellent seal against water and air. There are some modern glazing compounds today that come in a caulk tube, but these are not in the same league as the traditional glazing putties so I would advise staying away from these products. Glazing putty is primarily applied using a putty knife. Often small amounts of white lead or asbestos were added to putties to give them additional elasticity and improve their performance. Glazing putty was traditionally a combination of whiting (calcium carbonate) and linseed oil, though manufacturers would add different elements to achieve different consistencies and effects. Later, it became readily available at paint suppliers and hardware stores. It was heavily in use as a compound that was mixed on site by painters and glaziers when it was common for them to be mixing their own paints before the industrial revolution. Glazing putty was traditionally used to seal the individual panes of glass in wood, steel, and to a more limited basis, aluminum windows as early as glass was installed in the first windows. If you’ve got glazing putty questions this post has all the answers you could possibly want so dig deep and be ready to drink from a fire hose. I’ve been writing about glazing putty since the beginning of this blog in 2011 and using it long before that so I felt it was time I assembled everything you need to know about glazing putty into one comprehensive post. In the 1950s and 1960s it began to fall out of favor and things like proprietary glazing gaskets, caulks, wood glazing, and other options took its place. Glazing putty is a wonderfully versatile product that was used for centuries to install glass into the earliest windows. If you’re restoring historic wood or steel windows then you’re probably dealing with glazing putty rather than the modern glazing gasket systems.
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