PLEASE NOTE: Until further notice, our store in Rockland will be open BY APPOINTMENT ONLY, Monday through Saturday from 10:00 a.m. to 2:00 p.m. We are offering 15-minute time slots, and you may reserve up to 30 minutes. To reserve your time slot, call us at 781-871-1790. You may also place your order online and select "Pickup" as the shipping method. You may then pick up your order during reasonable hours (approx. 8a-6p Mon-Sat). You will need to wear a mask during your visit, and we kindly ask that you wash your hands or use sanitizer when you arrive. We look forward to seeing you!

Whittemore-Durgin Stained Glass Supplies
825 Market St., Rockland MA 02370
Phone: 781-871-1790  Toll-free: 800-262-1790
Stained glass supplies, art and architectural glass, and so much more.
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Cementing and Glazing Stuff for Leaded Glass


Glasspro Black Putty
Glasspro Black Putty

Glass Pro Putty is a fast-setting black colored stained glass cement designed for strengthening and waterproofing leaded glass panels. Unlike typical stained glass cement, which tends to be the consistency of pancake batter, this stuff is more the consistency of cookie dough. Some people find it easier to work with and easier to clean up after (with the help of whiting). It's a ready-to-use oil-based elastic compound that is easily applied. It adheres tenaciously to came and glass, expands and contracts with weather, and forms a tough surface coating while remaining permanently elastic. Apply at temperatures above 40 degrees F (4.5 degrees C).

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Lamp Black, 1 lb box
Lamp Black, 1 lb box
Item no: 8142
Empire Blended Products, Inc. item: Germantown LampBlack 1 lb
Retail price: $10.17 /each
3 or more $9.15 (10% discount)
6 or more $8.14 (20% discount)
In stock:  7  (units: each)
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A fine black powder, about the consistency of talcum, which we mix with other ingredients to make the leaded glass waterproofing cement in our studio. Its original source was the lampshades of the lamps used in the 19th century where it accumulated as the lamp burned. The amount of this carbon deposited on the lampshade was an indicator of the purity of the oil being burned. It was necessary to scrape the lampblack off from time to time, and various uses were found for it. It is now also used to color Portland Cement, when a dark grout is desired.