Does the Black Chrome II (PPB-4623) need a clear coat for UV protection?

Our Black Chrome II (PPB-4623) is considered a tinted clear coat in itself so the addition of another clear over the top of it would be considered redundant. There is simply no need.

Is Black Chrome II PPB-4623 used as a top coat or base coat?

Black Chome II PPB-4623 is meant to be used as a top coat. This is a tinted transparent so the substrate or base coat will have an effect on a cured Black Chrome II.

How will Black Chrome II look if applied over a white base coat?

Black Chrome II PPB-4623 is more or less a tinted clear. While we don't rate in opacity percentages I can tell you that we apply over shiny aluminum substrate for our samples. I feel that this applied over white would merely get you a grey color result. If you would like to have this applied over a white you can order up a custom spray-out. Here are the details on this process... If you would like a custom spray-out of any combination, we can provide that for a fee of $9.95 each plus shipping. This would be a custom panel with two coats of your choice. For a custom panel with three coats (base, mid and top coat), the fee is $14.95. The custom panels measure 3” x 5” and can take approximately 2 - 4 days to complete. Any order for such panels would need to be called in as they are not available online at this time.

When I try to top coat the top coat powder tends to fish eye how can I prevent that or is there some other process I need to do before putting on 2nd coat?

The fish eyes that you are seeing are probably starbursts which are the result of the charge (KV) being set too high when the second coat is applied. To prevent this from happening make sure to lower the voltage before applying the top coat. A voltage reduction of 10-15 KV usually does the trick.