I would not paint the inside white ever lol, my fiesta shell was painted fresh and run once before being stripped down and the white tunnel was burnt a nice crisp golden brown and trust me when I say it had more heat thermal barrier bonded to the bottom of the tunnel , not the cheap shit either like the teflon woven shit as It took me about two weeks to get it off lol. Every trainer mark , every finger print , drop of oil etc just seems to never come off
Looking forward to seeing the updates

Cheers Paul