Any suggestions on what to use on the aft deck ceiling? I have the popcorn looking texture.

The stainless bolts and hardware all have corrosion / green or grey and crusty. I'm assuming just replace that stuff, i.e. remove, paint then reinstall new hardware.
If anyone has redone this area I would be grateful to hear your methods and advice!

Also I would like to repaint or replace the weather board sections in the back.
What is easier, paint or replace? Some areas of this look newer, some areas the paint is severely weather checked.

Thanks!