As it is a friend s car i would like to help you solve it.
Orange peel roof.
One of the newest ways to repair textured walls and ceilings is with a gravity fed manually powered pressure sprayer.
You may need a stepladder depending upon the ceiling height.
The end result is a beautiful flat ceiling.
Just because a roof isn t aluminum or fiberglass don t assume its rubber.
Apply the orange peel to the ceiling keeping the gun between 3 and 4 feet away from the ceiling at all times.
If you want to totally get rid of orange peel you need to wet sand the car.
Repairing orange peel texture with a hand pump sprayer series real painter spraying.
Epdm is very smooth while tpo may be slightly bumpy similar to an orange peel.
This technique will be most appropriate if you have very large areas of damage or are applying a new orange peel texture to entire wall surfaces.
You can test for vinyl by giving a pinch to the roof.
This is how i tackle an orange peel texture.
My wife had some heavy scratches on the roof of her car that would have led to a big expense when she returned it off her lease so i figured why not give wet sanding a shot.
The clear coat on the roof came with a lot of orange peel.
Keep moving the gun.
Every texture requires a different process to get smooth ceilings.
Vinyl is also used for the roofs of campers and rvs.