When using Metalizers first apply 3 black base coats on your project and 1 or 2 coats of metalizer, add more coats for stronger effect.
Example 4 X 17″ car wheels in Blue metalizer :
This would need 3 cans of matte black and 1 or 2 cans of blue metalizer for top coat. If you want a stronger finish in blue metallic or wheels are 19″ then buy two cans of blue metalizer. Plasti dip works with full dip so you can buy full dip matte black for sale here.