Drying Time. Air-dry for 30 minutes before handling; allow 24 hours for drying to full hardness. Recoating may be
accomplished after 30 minutes of air-drying.
Thinners. If thinning is required, use mineral spirits paint thinner, TT-T-291.
2-23. VARNISH, SHELLAC (TT-S-300)
Characteristics. Shellac varnish is a solution or "cut" of a resin made from the secretion of certain insects. It dries
to a transparent film that is soluble in shellac thinner. It is not durable under exterior exposure conditions.
Use. May be used as a filling or sealing coat on wood, or as an intermediate coat to prevent the bleeding of oil-
soluble colors. It may also be used as an intermediate coat over an oil-type sealer.
Application. Shellac varnishes are usually applied by brushing. They can be sprayed when thinned properly.
Thinner. If thinning is required, use denatured alcohol, grade III.
Drying Time. Air-dry for 1 hour before handling; recoat after 2 to 3 hours of air-drying. Varnish dries to full
hardness after 24 hours.
Section V. THINNERS
2-24. THINNER, AIRCRAFT COATING (MIL-T-81772)
This thinner is used with CARC topcoats and primers. Type I is used with MIL-C-46168, MIL-C-53039, and those CARC
epoxy enamels and primers using MIL-T-81772, Type II, if Type II is not available. Type II is used with MIL-C-22750, MIL-
P-53022, and MIL-P-23377, Type I.
Wear impenetrable gloves when using this thinner.
2-25. OIL, LINSEED, RAW (TT-L-215)
When used as a thinner in pigmented coating materials, it reduces the pigment-to-oil ratio, resulting in a thinner coat.
Paints thinned with linseed oil are used as sealing and priming coats on bare wood.
2-26. THINNER, ENAMEL, SYNTHETIC (TT-T-306)
This thinner is a mixture of volatile coal-tar and petroleum derivatives. It is used to thin synthetic resin-base varnishes
enamels. Do not use to thin lacquer.
2-27. THINNERS, LACQUER, CELLULOSE NITRATE (TT-T-266) AND LACQUER (MIL-T-6095)
Lacquer thinner TT-T-266 evaporates much less rapidly than lacquer thinner MIL-T-6095. These thinners are intended for
use during periods of high humidity to prevent the condensation of moisture on the surface of the lacquer film. Such
moisture seriously impairs the lacquer coating.
2-28. THINNER, PAINT, MINERAL SPIRITS (TT-T-291)
This is a water, white-petroleum derivative similar to and used interchangeably with dry-cleaning solvent. It is used as a
thinner for asphalt paints and oleoresinous enamels, paints, and varnishes, except synthetic, resin-base enamels and
varnishes. It will curdle or decompose these latter materials. Do no use to thin lacquer.
Change 3 2-9