An excellent clear spirit lacquer for brass may be made by dissolving, with the aid of gentle heat, in a water bath in a well tinned vessel, that can be closed to avoid evaporation, one pound of gum sandarac, one and one quarter pounds bruised white shellac and one quarter pound gum elemi in four gallons of 188° denatured alcohol. When dissolved, strain off and treat the sediment with more alcohol, then filter through cloth.
Another good formula for clear brass lacquer is to dissolve one pound seed lac, one pound bleached shellac one half pound genuine Venice turpentine in three gallons of denatured alcohol (188° grade).
Colored lacquer for brass can be made by simply dissolving gamboge and dragon's blood separately in alcohol, straining the resulting colored liquids and adding sufficient of each to either of the above clear lacquers to obtain the desired effect.
This so-called cement or unskrinkable putty is used to quite an extent for what is known on the inland lakes as a material for "paying seams" on wooden craft and is in the form of glaziers' putty. Should be mixed as stiff as possible, then permitted to "sweat" a few days, and finished by giving it a loose run through a mill, or if the batch be large enough, put through a putty chaser. For a batch of 500 pounds mix the following: 250 pounds bolted gilders' whiting, 75 pounds bolted English china clay, 30 pounds dry white lead, 80 pounds pure white lead in oil (keg lead) 50 pounds bodied linseed oil (without drier), 10 pounds pale rosin oil, 5 pounds paint (paraffine) oil.
This is pressed into the seams with flexible putty knives of proper width, after the edges of the seams have been given a coat of seam paint, of the following composition:
Grind fine the following paste: 44 pounds bolted gilders' whiting, 6 pounds keg lead in oil, 12 pounds bodied linseed oil. On cooling, thin this paste with 18 pounds bodied linseed oil and 22 pounds paint oil (paraffine oil, debloomed). Net result 100 pounds or 8 1/2 gallons liquid paint, weighing close to 11 3/4 lbs. each.
If these compositions are required in colors, such as buff or red, use ocher for the former with the white and strong red oxide for the latter; for gray or lead color, tint with lamp-black. The cement, when used as outlined, after coating the edges of seams with the paint, will never dry brittle, but retain its toughness and elasticity, and therefore will not lose its hold.