Originally Posted by 5wndwcpe
I blast them then coat with liquid graphite. Looks very much like bare cast iron and touch ups are easy.

https://www.ebay.com/i/182627664612...msclkid=4371e94a76b21844d771b63f5a404714


That's exactly what I did. I used the product Slip Plate, a graphite spray lube. I did my exhaust manifolds in February. They still look great. Came out much better than the cast blast.
I bought it at Grainger. However, I read that Napa sells it too.

https://www.grainger.com/product/1WVK7?gclid=EAIaIQobChMI-8mdxsWU7AIVATiGCh3djASPEAQYAiABEgIKmPD_BwE&cm_mmc=PPC:+Google+PLA&ef_id=EAIaIQobChMI-8mdxsWU7AIVATiGCh3djASPEAQYAiABEgIKmPD_BwE:G:s&s_kwcid=AL!2966!3!281698275537!!!g!472123448796!&gucid=N:N:PS:Paid:GGL:CSM-2295:4YUPY8:20500731