Start with a color-keyed AutoBorne Sealer for best orientation. Auto Air Metallic Colors lay down flat with an even when applied over a color-keyed base color as opposed to a white or black base. By color-keying with the base color, less material is required which reduces the build that creates a mottled, splotchy finish. Using minimal amounts of the Metallic paint, is key to achieve an even finish. It is also important to allow for adequate drying time. If the underlying coat is still tacky, the next coat will accumulate along the underlying coat's metallic pattern and develop channels which will create a mottled appearance. Color-keying the with the underlying base color saves not only material, but allows for quicker drying times due to less material per coat and an even orientation in the finish.
Allow each coat ample time to dry. When the pearlescent powder in the underlying coat is truly dry, the next, wet coat's pearlescent powder will not accentuate the underlying pattern resulting in 'channeling' of pearlescent in the finish. Applying a well-orientated coat in an even and consistent spray pattern that is properly atomized is essential to a achieving a great finish. Using with a color-keyed AutoBorne Sealer makes this much easier when painting helmets, bikes, cars and any large paint job.