Exhaust headers are sandblasted. Now what?

There’s a ton of testimonials on here, that suggest on cast iron, properly applied, it works quite well.

Good morning everyone, there has been some delays and
now the headers wont be back with me until at least Jan 5th. They will carry a lifetime warranty so if anything happens i’ll just senf them back. I’ll post pics as soon as I get them.
Happy New Year to you all!