Generally speaking, you could choose one of the following additives for this issue. If you're talking about a solvent-based system, which I presume you are, you can try either our DISPERBYK-162 and/or DISPERBYK-110 at a dosage between 2.0-2.5 (solid on pigment). Another important thing is the orientation of the aluminum flakes to achieve a uniform appearance (avoiding cloudiness). For this, we could propose the following additives: CERAFAK-103, CERAFAK-106, CERAFAK-110, CERATIX-8461, CERATIX-8483 or CERATIX-8466. If you're talking about water-based systems, our recommendation is our DISPERBYK-180 and/or DISPERBYK-192 or DISPERYK-2060 and, for the orientation, our AQUATIX-8421 in combination with Laponite-RD.
The additive type is highly depending on the type of pigment used. Our first recommendation would be DISPERBYK-2200, DISPERBYK®-2000, DISPERBYK®-2001. In base coat systems with a level of 70% additive solid on pigment. For top coats we recommend DISPERBYK-2013, DISPERBYK-2200 or DISPERBYK®-161 with the same level of addition. Also commercially available laboratory products (LP-products) are available, please get in contact with us in case these suggestions would be helpful.
DISPERBYK-2012 is our first choice for resin-containing pigment grinds for both waterreducibles and emulsions. Slurry grind allows presence of amine, thickener, surfactant and co-solvent. DISPERBYK-2012 provides good stabilization of a wide range of pigments, mainly transparent and opaque organic pigments. With carbon blacks high jetness can be achieved. There is no negative impact on stability of pH-sensitive systems.
First LAPONITE has to be added slowly into demineralized water while stiring. This avoids the formation of gel particles. Also it is importatant only to add the LAPONITE solution as long as it is liquid. Postaddition of polypropylene glycole increases the using time of the LAPONITE solution drastically.
BYK-3560 is able to increase the surface energy of the curred paint when it is able to oriented to the interface. The effect is depending on dosage and curing temperature. It can work in solventborne and waterborne systems and have no influcence onto the surface tension of the liquid paint.