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Putty & Glazing Compound

Posted: Mon May 04, 2015 8:05 pm
by johnleeke

(Updates: 1/23/17 Sarco ingredients; 4/5/15 new details on Wonder Putty and Glaze-Ease)

Traditional Putty, Linseed Oil Type This is “knife
grade” (can be applied and smoothed with a knife)
material, which firms up within a few days or weeks and
then hardens over a period of months or few years.
Typically it contains boiled or raw linseed oil and
Specific products:
• Allback Linseed Oil Putty (can paint
immediately with Allback paint)
• Crawford’s Natural Blend Painters Putty
• Old-Time Putty (no longer available)

Glazing Compound, Modified Oil Type This is knife
grade material, which firms up within a few days or
weeks and then is semi-hardening, retaining some
resilience. Typically in contains a mixture of oil types,
linseed oil, soybean oil, process oil, mineral oil, and
plasticisers, drying agents, whiting, ground limestone,
powdered talc, etc.)
Specific products:
• Sarco MultiGlaze Type M (skins over in a few
or several days, must be applied in the shop)
• Sarco Dual Glaze (longer skin over, longer
lasting in service, for outdoor use)
• Glazol Glazing Compound
• Wonder Putty (formerly Perm-E-Lastic, remains slightly flexible even after 8 years, limited skin over)
• SashCo Wood Sash Putty (no longer available)
• Perma-Glaze (no longer available)
• DAP ‘33’ (included on this list because it is
so common. Many window specialists usually
consider the glazing compounds listed above

Acrylic Elastomeric Type This is “gun grade”
(applied with a caulking gun) that typically contains
acrylic resin and water, which make it subject to
shrinkage. It cures to a flexible elastic almost rubber-like,
Specific products:
• Glaze-Ease 601 (dries quickly for painting
within 24 hours, requires very different application and tooling
methods, shrinks somewhat after tooling as water evaporates)

Acrylic Type This is knife grade and typically contains
acrylic resin, limestone, quartz and water. It hardens in
a few days and may shrink or crack during drying in
some conditions.
Specific products:
• Aqua-Glaze (dries quickly for painting within a
few hours)
• Elmer’s Glaze-Tuff (no longer available)

Putty and ingredients % by weight (comments by JCL)

Allback Linseed Putty
Calcium carbonate 65-45 (aggregate filler, aka whiting)
Linseed oil, raw 35-55 (drying oil binder)
(source: product MSDS)

Sarco Multi-Glaze Type M
Calcium Carbonate (aggregate filler)
Ground Limestone (aggregate filler)
Cobalt Naphthanetic Oil (promotes rapid skinning, MSDS says "napthanetic oil", Jim says "Cobalt drier")
Linseed Oil (drying oil binder, Jim says no Soybean Oil)
(source: product MSDS; Jim Sarsfield, manufacturer, 1/23/17)

Sarco Dual Glaze
(the same as Type M above without the Colbalt, source: Justin Smith)

GROUND LIMESTONE 80 (aggregate filler)
SOYBEAN OIL BLEND 10 (drying oil binder)
POLYBUTENE <5 (plasticizer and extender)
STODDARD SOLVENT <5 (mild solvent similar to mineral spirits)
source: product MSDS,

GROUND LIMESTONE 85 (aggregate filler)
SOYBEAN OIL BLEND 10 (drying oil binder)
POLYBUTENE <5 (plasticizer and extender)

Aqua Glaze
calcium carbonate 75-80
butyl benzyl pthalate 0-5 (plasticizer, BBP is being phased out in Europe and Canada where it is classified as a toxic substance)
source: MSDS

Dap 33
Calcium carbonate 60-100
Soya oil 3-7 (drying oil binder)
Parrafinic process oil 1-5 (non-drying waxy petroleum oil)
Tremolite 1-5 (**, silicate mineral)
Talc 1-5 (soft "slippery" mineral powder)
Antigorite 0.5-1.5 (**)
Titanium dioxide 0.1-1.0 (white pigment)
*Silica, crystalline 0.1-1.0 (**)
*Anthophyllite 0.1-1.0 (**)
*=suspected or confirmed to cause cancer.
source: product MSDS,
**=probably a "contaminant" that comes along with another ingredient, because it is hard to believe they would put hazardous materials in putty on purpose

Wonder Putty (formerly Perm-E-Lastic)
Calcium Carbonate greater than 70% (aggregate filler, with a specific variety of particle sizes, includes crystalline silica)
Talc greater than 5% (acicular, needle-like acting like "re-bar" to tie the mass together)
Blend of Soya Oil and Menhaden Fish Oil (drying-oil binder and non-drying oil plasticizer)
Inorganic Fillers and Color Pigments
Source: Atlas Co. tech sheet and MSDS MSDS admits there are other ingredients but keeps them a secret)(Interview with Atlas chemist on 4/4/16)

Crawford's Natural Blend Painter's Putty
Ground Limestone
Calcium Carbonate (may contain trace amounts of crystalline silica at levels between 0.01% and 0.5% and varies naturally)
White Refined Linseed Oil (vegetable oil)
Heat Polymerized Linseed Oil (vegetable oil)
Organophilic Clay
Titanium Dioxide
All other ingredients are < 1%

Re: Putty & Glazing Compound

Posted: Mon Apr 11, 2016 11:47 pm
by RubyRed
John, Several commercial glazers will only use Vulcum on replacement windows as it is easy to apply with caulk gun and doesn't shrink, comes in many colors. Do you recommend vulcum, or prefer we use one of the putty brands listed in your forum. thx tbb

Re: Putty & Glazing Compound

Posted: Tue Apr 12, 2016 2:37 pm
by johnleeke
Tremco's Vulkem 116 Polyurethane Sealant is a one-part, moisture-curing, gun-grade polyurethane sealant. I don't know anything about Vulkem or how the commercial glaziers use it on replacement windows.

I would not use Vulkem for glazing glass panes into wooden sashes. For this use consider the specific products listed under "Glazing Compounds" above. The top-listed products are the ones most used by historic window specialists around the country.

I do sometimes use another one-part, moisture-curing, gun-grade polyurethane sealant, Sonolastic's NP1, for sealing joints between exterior woodwork joints, like around the outer perimeter of the exterior casing boards and the wall siding, or between the brick-molding around the window and the masonry wall. So, Vulkem could be useful in these situations, but like I say, I've never used it.

Re: Putty & Glazing Compound

Posted: Sun Jun 17, 2018 8:24 pm
by johnleeke
Traditional linseed oil and whiting putty has been tested and developed over four centuries of making and maintaining wood windows. It has been proven that simple linseed oil and whiting putty is better than anything that has been tried.

==> easily and economically applied
==> durable, lasts 20 to 50+ years
==> compatible with most paints so the paint can form a continuous seal from wood, over the putty and onto the glass
==> does not trap water in the wood
==> does not damage the wood or glass
==> fails gracefully so it is easily maintained or replaced
==> not made of petrol-chemical materials and bio-degradable so it's easy on the environment
==> more that one product to choose from to get the specific characteristics you need, or make your own

Re: Putty & Glazing Compound

Posted: Sun Sep 20, 2020 4:33 am
by johnleeke
Crawfords, from 2015 msds ... LIiV4yEDp4

Ground Limestone 471341
Calcium Carbonate* 1317653
White Refined Linseed Oil
(vegetable oil)
Heat Polymerized Linseed Oil (vegetable oil) 67746081
Organophilic Clay 68953582
Titanium Dioxide 13463677
All other ingredients are < 1%