Work the paste into the cracks with a tooth brush. Mix a little boiled linseed oil into a bit of glazing putty so it forms a loose runny paste. Do not do this step if you do not have strip of metal to protect the glass from scratches.ħ. Use a thin metal slat from an old Venetian blind or strip of sheet metal to protect the glass. But, DON'T SCRATCH THE GLASS WITH THE SANDPAPER. The oil will help control any lead-containing dust. If the putty bevel surface is rough and needs to be smoothed, sand it right in the wet oil. The oil will seep into the cracks, then brush again, more will seep in, come back in 10 minutes to apply a little more oil and brush, repeat three times.Ħ. If the putty has cracks but is still well attached, brush some boiled linseed oil onto the line of putty and brush it back and forth so it soaks into the cracks. Pre-treatment can be the traditional boiled linseed oil mixed with turpentine or alcohol, or a contemporary penetrating oil-base primer product, such as Penetrol.ĥ. Brush a pre-treatment on any exposed bare wood in the glazing rabbet and let it dry. Also apply tape to the face of the stiles and rails if you will not be repainting them.Ĥ. Mask off the neighboring glass and wood surfaces with 2" wide blue masking tape to the glass along the edge of the putty before starting. Use a razor blade in a holder for scraping and a drywall knife as a stop to protect the putty.ģ. Clean paint off of glass, and even up the edge of the putty where it meets the glass to form a more-or-less straight line. A razor blade may be needed on the glass.Ģ. The surfaces must be perfectly clean: bare bright wood, and sparkling glass. Use a 1/2" wide brass brush and pull-type scraper to to clean up glass and wood surfaces in the glazing rabbet. Don't go crazy trying to get all the putty out, just take out what is loose. Remove loose putty with a utility knife and pull-type scraper. This may shorten the life of the repair somewhat, so use boiled linseed oil for best durability and longer life of the repair.ġ. For a faster production rate a penetrating drying oil can be used instead of boiled linseed oil. Linseed oil materials may dry and cure slowly. Many spots on more that one window can be treated at the same time, achieving an efficiency of scale. Spot putty maintenance helps seal the glass to the wood helping to prevent movement of the wood due to moisture it can extend the life of the putty for several or many years. Movement of the sash and shrinkage of the putty over the long-term causes the putty to crack and fall out. Save all putty in good condition if doing a conservation type of treatment. If more than 25% of the putty on a sash is damaged, consider completely reglazing the entire sash. This treatment is suitable for sections of missing and cracked putty when the remaining putty is tightly adhered or is in good condition. People who are struggling (or spending a lot of work, time and money) to get the old putty out don't realize that it is often possible to leave it in place and do simple putty maintenance and spot repairs.Ĭondition to be Treated: Putty failure in tightly localized spots.ĭescription: Remove sections of loose putty, seal cracks in putty and paint. It fails so that it is easy to remove and replace with more putty. The way it fails is an important part of the glazing system. Traditional glazing putty has been carefully developed over the past four centuries to be easy to apply, keep a good seal between wood and glass for many years, and then fail gracefully. (Update: 7/2/16 revised tool list, added step 2. Posted: Tue 5:52 pm Post subject: Glazing Putty: Maintenance and Repairs Historic HomeWorks Forum Forum Index -> Windows & Doors Historic HomeWorks Forum :: View topic - Glazing Putty: Maintenance and Repairs Historic HomeWorks ForumĪsk questions, post replies, seek guidance, help others, keep in touch.
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