60 lbs. dry zinc white, 30 lbs. of the bodied oil and 10 lbs. gum spirits of turpentine. Allow this base to cool, then beat it up in a power mixer (change can) with 2 1/2 gallons turpentine and add 16 1/2 gallons palest kauri gum varnish (wearing body or white enamel varnish, so-called).
If marine enamel of lower price is wanted, grind American selected zinc white in place of the French process zinc, as above, and thin in the same proportion as above, using a good white mixing varnish. The weight per gallon in either case should not exceed 10 pounds in order to make the enamel flow freely.
A white paint of this class is often in demand for yachts and motor boats. The idea is to have as little glare as possible and the paint is expected to last one season only and is expected to wear in such a manner, as to make it easily removable leaving a clean surface for repainting.
Grind a base of 45 pounds American zinc oxide, and 30 pounds magnesium silicate (asbestine) and one pound white sugar of lead in 24 pounds of clarified or refined linseed oil and, on cooling, thin this paste with 4 gallons turnpentine and 2 gallons moderate priced white mixing varnish, producing 10 gallons of paint, weighing 13 pounds per gallon.
This paint applied to the hulls of steel craft, will gradually wear off and leave a surface, that, with very little sandpapering, will be ready to receive new paint, without the necessity of burning off or using paint remover.
When selling price permits, a paint of similar characteristics, but of far better covering capacity can be produced by grinding a base of 40 pounds sublimed white lead and 40 pounds American zinc white with 2 pounds white sugar of lead in 18 pounds refined oil, thinning this soft paste with 2 1/2 gallons turpentine, 1/2 gallon pale drier and 2 gallons of clarified oil of good body, thus producing 8 3/4 gallons of paint, weighing 15 1/2 pounds per gallon. The use of varnish in this latter formula is best avoided, as sublimed white lead does not act well with varnish, when the paint is kept in stock for any length of time.
A very good black paint for use on steel ships above the water line is produced by grinding a paste as follows:
10 pounds best gas carbon black, 5 pounds dry red lead, 30 pounds water floated silex or silica, 55 pounds boiled linseed oil. It may be put up in paste form to be thinned by the consumers with linseed oil, dryer and turpentine or may be put up in ready for use form by the following formula. Beat up in a paint mixer 45 pounds of the paste black and add 43 pounds boiled linseed oil, 7 pounds strong liquid dryer and 5 pounds turpentine. Result 100 pounds or 11 gallons paint.
Note. Do not use a japan or liquid dryer, that contains rosin or lime, but let it be a concentrated oil dryer. This black is considered a very high grade material and will give very good service.
This paint can be put up in paste form after grinding on the following formula: 15 lbs. magnetic black oxide, precipitated, 1 lb. carbon black, 6 lbs. zinc oxide, 18 lbs. fire boiled linseed oil. The percentage of oil required depends largely on the gravity and fineness of the magnetic oxide. It may also be cheapened for cost by the addition of barytes to the extent of one third the weight of the magnetic oxide without materially increasing the oil required in mixing and grinding. It is not recommended to offer this paint in liquid form.
A good black paint, useful on the hulls of wooden or iron vessels, where long continued wear is not looked for so much as low selling price may be made by mixing carbon black paint with benzine asphaltum varnish. It is necessary, however, that the latter, when tested by itself, should dry to the touch in three or four hours. The black to be mixed with this must be ground in boiled oil and must not be extended with any heavy inert material, such as barytes, etc., nor should it contain any whiting, gypsum or silex. To 8 gallons benzine asphaltum varnish (free from coal tar) add 4 pounds lampblack in oil previously mixed with 12 pounds boiled linseed oil and 2 pounds strong liquid dryer. When well mixed, strain through a sieve or fine paint strainer. Result 10 gallons.