With Omni paint, you should be able to install PPG over it ( Omni is the less expensive brand of PPG ). What I have used is PPG's DP-90 sealer/primer. What I would do is paint the hood your base color, clear it, let the clear dry, than mask off for the hood black out, scuff it up with a Scotch-brite pad (gray), wipe it down good, and spray the DP-90 over it. I usally put 2 wet coats on and then go back on the final coat and dry spray it, that will give you the mate effect you are looking for. DON'T clear coat over this, that way it will look like it did from the factory.
If you have any questions on this, e-mail me at:
[email protected]
Good luck,
Jeff