type for painting inside surfaces of swimming pools, water tanks, and so forth. Both types contain small
percentages of titanium dioxide, zinc sulfate, water repellents, and calcium or aluminum stearate.
(18) Plastic paint. Plastic paint is another type of protective coating available on the market in
recent years. The word plastic, as applied to paints, is an abused term. The fact that this word or some
variation of it appears in a trade name does not necessarily mean the product has extraordinary
properties. Any synthetic resin paint might be called plastic paint because the phenolic, vinyl, and other
synthetic resins commonly used in paints are varieties of plastic, compounded with special grades of
solution-type resins. True plastic coatings are now available, and some of the common ones are
discussed below. These are tough, flexible coatings that are highly resistant to the natural elements and
many chemicals. They are especially suitable on surfaces where most other coatings have been
ineffective. With increased use and improved application methods, costs of plastic coatings are
expected to decrease.
(a) Vinyl-resin plastics. Vinyl-resin plastics are being used as protective coatings. They
include plastisols, organosols, and dry (generally powdered) vinyl resins. Plastisols are vinyl resins that
are dissolved in liquid plasticizers, which remain chemically unchanged until heat-treated. Organosols
are similar to plastisols, except small amounts of volatile solvents are added to improve the application
properties. Both have a high solid content; and the plastisols are essentially 100 percent solids. The
fusion of resins and plasticizers to form plastic film is caused by raising the temperature of the film
between 300 and 360€F. These plastics are used to manufacture such items as dishwasher racks, dish
drainers, plating tanks and racks, piping and vinyl-on-metal laminates for luggage, instrument cabinets,
and furniture. Other plastics, such as cellulosic, acrylonitrile, and acrylic are being used as protective
coatings. These are generally applied by heat processes when the dry resin is fused onto the surface to
be protected. They are applied as temporary coatings to gears, shafts, screws, and other machine parts
during shipment and storage.
(b) Plastic tapes. Plastic tapes are being used to protect steel pipe. Self-adhering plastic
tapes and those requiring a primer are available. Polyethylene and polyvinyl-chloride tapes are the most
common ones and are available in 10-, 12-, and 20-mil thickness (20 mils is 20 thousandths of an inch).
You will generally use a wire brush to clean the surface, and a primer may be needed before you apply
(19) Floor and deck enamel. A paint with a varnish vehicle is, in reality, an enamel. It is
intended for body and final coats on primed wood and concrete surfaces. It is an excellent, fast-drying,
tough covering that is flexible enough to withstand wear and weather. To make self-primer for-
A wood floor: Add 1 quart of thinning liquid (1 part turpentine or mineral spirits and
2 parts boiled linseed oil) to 1 gallon of floor-and-deck enamel. Body coats that you
mix for wood floors should have 1 pint of boiled linseed oil added to each gallon of
enamel. Apply the final coat as furnished in the container.