Hey Simon. Thank you!!
Yep, Scotchbrite just to clean up the tubes and the welds. Your pic is probably more likely done with a tubing belt sander. I'm going to wrap my entire exhaust so I'm not really super concerned with super detailed finishing but you should easily be able to duplicate your pic.
Here are the pics of molds put back together and the stands mounted. I still need to do final wet sanding and polish of the gelcoat before making the parts but that should get underway next week.