what is the recipe for the Plaster of Paris, turpentine and linseed oil mixture?
Answer To a given amount of plaster of paris, add equal amounts of linseed oil and turpentine. Add the liquid to the plaster and mix until the mixture has a consistency of a thick pancake batter. Apply to the leaded glass panel with a tampico bristled brush and work it into the void between the glass and lead. Do this on both sides of the panel. Clean up each side before turning over. Sprinkle more plaster of paris and clean by working the plaster into the puttied lead with a dry tampico brush. Not the one used to apply the mixture. Let the panel set up (preferably overnight) and do the other side. If you use the dry brush, the oils in the brush and the sulfur in the plaster will react with the lead to give it a nice burnished patina. Exposed to the elements, the lead will eventually turn gray with a protective patina of its own that will resist further oxidation from the atmosphere. Don’t let the mixture set for too long (as in 4 or 5 days)without cleaning the panel (as noted above),a
