We recommend adding an adhesion promoter to improve adhesion to metal substrates. Tech-7063 and Tech-7205N are general-purpose adhesion promoters recommended for use in acid-catalyzed systems, such as solvent-based polyester/amine systems. These products can be added later in the process; a 1% addition can significantly improve adhesion to galvanized steel. The recommended initial addition rate is 1%. We recommend conducting gradient tests for both Tech-7063 and Tech-7205N.

We recommend preparing a single pigment paste and first checking the viscosity of the pigment paste. Using appropriate wetting and dispersing agents will significantly reduce the viscosity. Low viscosity in the pigment paste indicates good wetting and dispersion of the pigment. Next, we recommend using the pigment paste to prepare white mixtures, such as white with carbon black, with iron oxide red, and with phthalocyanine blue. Test the applicability, grindability, and stability of these white mixtures under high-speed agitation. The mixture should be stored in an electric forced-air oven at 50°C for at least 3 days, after which the previous application tests should be repeated. A good mixture exhibits high gloss, good leveling, and a low delta E value (< 0.5) both before and after the storage test, with no significant changes in color or gloss during storage. We recommend testing Tech-5366 with titanium dioxide and inorganic pigments, while Tech-6202 and Tech-6320 can be used to disperse carbon black. For colored pigments, we recommend Tech-5350, Tech-5835, and Tech-6320; for defoamers, we suggest Tech-426F. Please contact us for initial reference formulations and recommended usage levels. Usage levels (depending on the type of pigment) can vary significantly.

This resistance to sedimentation can be achieved by using specially developed additives such as Tech-9022W, which form a network structure within the system and induce pseudoplasticity. Controlled flocculating wetting and dispersing agents, such as the multifunctional Tech-60701, operate on a similar principle. These additives cause dispersed particles to aggregate into a loose structure, which can sometimes result in higher viscosity and good resistance to sedimentation.