Im not familiar with the products that you are using, it looks like you have 3 components for the clear. Is the basecoat ready to spray or do you need a reducer for that too? The black should give you good coverage but red and yellow over black will probably be poor hiding. Stick with more light coats because if you get heavy it will take forever to dry. Im not sure that you need to wait 3 weeks for the black to dry, check with your supplier.