Using a white paint on a roof will reflect much of the suns rays; thereby keeping the structure under roof cooler. Paint on the ceiling will have a minimal effect compared to paint on the roof.
What kind of dried paint? What is under the paint on the ceiling? ....on the metal?
Paint the ceiling first. Work top down.
The Sky
Michelangelo painted the ceiling of Sistine
Stand on a ladder
Yes, as long as they are both the same base, you can mix many paints.
The ceiling of the Sistine Chapel in the Vatican, Rome.
No
no
the Sistine Chapel
yes, you can paint ceiling tiles. We have done it many times. Painting may effect their UL listing however.
It helps to have the same paint that was used to paint the ceiling in the first place. Next best option is knowing the exact color and product the paint was in. Next to impossible is buying a can of "ceiling paint" and using that. There are way to many different shades and sheens of ceiling paint to guess. Thin out the paint approx one ounce of water or thinner, depending on the paint base, to eight ounces of paint. Brush or roll the area that is being touched up, then feather out the edges of the paint so that it blends into the existing paint. Feather out means to spread the paint along the edge of the touch up area into the surrounding area so that the touch up doesn't have a hard edge.