You can test for vinyl by giving a pinch to the roof.
Orange peel roof.
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 end result is a beautiful flat ceiling.
This is how i tackle an orange peel texture.
Apply the orange peel to the ceiling keeping the gun between 3 and 4 feet away from the ceiling at all times.
Epdm is very smooth while tpo may be slightly bumpy similar to an orange peel.
You may need a stepladder depending upon the ceiling height.
Just because a roof isn t aluminum or fiberglass don t assume its rubber.
It s not hard but does take time and can be scary.
The clear coat on the roof came with a lot of orange peel.
Vinyl is also used for the roofs of campers and rvs.
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.
One of the newest ways to repair textured walls and ceilings is with a gravity fed manually powered pressure sprayer.
If you want to totally get rid of orange peel you need to wet sand the car.
An epdm rubber roof will also take on a chalky look.
Keep moving the gun.
As it is a friend s car i would like to help you solve it.