Putty that is painted very quickly, say within a day of application, may take years to harden since the paint (oil only) will further diminish the supply of oxygen. No, stain the wood before finishing the holes or surface defects with Plastic Wood Solvent Wood Filler, choose a Plastic Wood Solvent Wood Filler color closest to the finished color of the wood, fill the hole, and let it dry, then sand it smooth if necessary and apply the same stain with a cotton swab to the filled area to match the finished wood color. Once the surface hardens slightly, called "skinning," the rate of drying decreases as the source of oxygen is diminished. This is the most common glazing putty that professional window restorers use and it’s what my shop uses about 90 of the time. The linseed oil reacts with oxygen in the air to harden the putty. Putty's slow drying time is a byproduct of the way it dries, which is oxidation. What the pros do is put a panel in the window opening until the sash is refurbished. If you paint too soon, you will end up re-doing the putty. If you prime too soon, the putty will tend to separate from the glass and /or wrinkle. Predating caulk by decades, window putty was designed to make a seal between dissimilar materials (glass and wood), to remain flexible for a long time, and to be paintable. If the directions say 7-14 days, they mean it - in a warm, heated dry shop. They are stickier and thus are difficult to use for window glazing. Other putties, such as painter's putty, are chemically similar but often have a creamier consistency more suited to exterior hole filling. It is mixed at the factory to a consistency that can be worked to a smooth surface without excessive sticking to the tool, or putty knife. If you spot any gaps or aren’t happy with the coverage, repeat Step 2 and 3 until you have a smooth line. Use the edge of the window frame as a guide and run the knife flat along the putty. Such a handy tip This will soften the putty and allow for you to smooth the surface. Can also be thinned with purified raw linseed oil to bridge between old still. Glazing putty is a mix of boiled linseed oil, calcium carbonate and probably other additives that remain the secret of the conspiratorial, world-dominating putty industry. Step 3: Dip the end of the putty knife in mineral turpentine. Linseed Oil Putty for window restoration and for filling small cracks.
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