TLCs can be used as colour change pigments in the form of microencapsulated slurries in water. The products are available as 40% (weight) solids content with microcapsule diameters centred in the range 10-15 microns. They are custom formulated to the required colour change properties. These slurries can be used to make sprayable TLC coatings by addition to aqueous binders.
Two series of TLC coatings are available. Both are aqueous, acrylic-based and designed for application by spraying through an airbrush or similar compressed gas sprayer. They have good adhesion to most surfaces and matt and gloss finishes are achievable by varying the coating thickness.
SPN100 Series – For optimum colour brightness and ease-of-use. They can be removed easily by washing with water.
SPN300 Series – For some degree of water resistance. They can be used underwater for limited periods of time.
The use of microencapsulated sprayable TLC coatings overcomes many of the problems associated with using unsealed TLC mixtures, although the reflected colours are less bright. Applied as a thin film, the coatings will dry to give a finish, which will resist light abrasion. They can be sprayed directly onto the test surface and are particularly useful when the surface is not flat.