An old friend of mine worked on KC-135's when we first met back in the mid-70's. Several years back I bought him a 1/72 model of one he could build with his kids. He is a very methodical engineer and proceeded to take the instructions and go out looking for the paints specified.
He sent me an e-mail, "I have been looking for the paints for the model and I found it requires two colors of White, a gloss White for parts of the airplane and a flat White for the toilet paper in the bathroom."
I replied, "Jim, can you see the bathroom when the kit is put together?"
He said, "No...."
So I suggested he not worry about using gloss White for the toilet paper.