SELLINGLUMBER 379 



valve action. Moisture from the outside will be denied ready 

 entrance, but moisture in the wood will be allowed to escape freely 

 during dry weather. The action of the sun will, moreover, bring 

 to the surface, without causing bad effects, any resin or sap which 

 might be present in the surface of the wood. Exposure over the 

 summer months will generally be found sufficient to weather out all 

 of the objectionable contents df the lumber. It should then receive 

 preferably two more coats of paint. 



General Directions. The paints, varnishes and finishing ma- 

 terials referred to herein generally contain upon the labels full 

 printed instructions for their application. The procedure outlined 

 herein for the painting and finishing of Yellow Pine may, however, 

 be followed with assurance of most excellent results. 



EXTERIOR PAINTING. 

 Yellow Pine. 



No paint or other finishing material should be applied in damp 

 weather. The interior plaster work of a new structure should be 

 allowed to dry thoroughly before applying paint to the exterior of 

 a building, as the water drawn out through the wood might cause 

 blistering. The surface of the wood must be free from moisture. 

 Weathering of the wood previous to the application of paint is gen- i^Vine 

 erally advisable in order to allow thorough seasoning and drying Exteriors 

 out. If the wood has been previously painted, all old, loose paint 

 should be removed with a wire brush. If the wood has not been 

 previously painted, all knots and sap streaks should be brush-coated 

 with turpentine not more than one hour previous to the application 

 of the first coat of paint. (Never use shellac for coating knots.) 



Priming Coat. Never use ochre as a priming coat. Serious 

 results are bound to follow. A high-grade prepared paint* made 



*U. S. Army Paints (White). 



The majority of the high-grade paints to be purchased from reliable 

 dealers will closely approximate the prepared paint called for by the 

 specifications of the U. S. Army, which are as follows: 



"The paint must be furnished in prepared form, ready for applica- 

 tion. White paint must contain not less than 66 per cent nor more 

 than 70 per cent of pigments, the balance to be liquids. The liquids 

 shall consist of pure raw linseed oil, containing a total of not over 10 

 per cent of turpentine and turpentine drier. The pigment portion of the 

 paint shall consist of white lead (basic carbonate or basic sulphate) and 

 zinc oxide. There shall not be less than 25 per cent nor more than SO 

 per cent by weight of zinc oxide. Paints of this composition containing, 

 in addition, not over 15 per cent by weight of such white pigments as 

 barytes, china clay, whiting, asbestine, and silica will be accepted under 

 these specifications." 



