Sure you can. Use Porch and Floor enamel for a good finish. Available in Home Depot.
Not without taking some steps. Your best bet will probably be to apply a layer of primer, then after it dries, the new paint.
first paint the walls with an oil based paint then emulsion over the top when dry
Yes, you can
yes you can!
It will work over another latex paint, however it won't be as scrubable as a normal top coat, and it won't adhere as well as a paint over a primer. Better to apply the primer, then the paint. If the surface is clean and deglossed though, you really don't need a primer and can coat the surface with a quality wall paint.
The only capping I know of is the removing the top (caps) from fruit such as strawberries.
Paint the ceiling first. Work top down.
If your dividing the wall the lighter paint should go on top
Not a good idea if you expect it to last. I would strip it, re-prime it properly then paint it.
It's easier if you paint around doors and windows and top and bottom of walls first.
Not without taking some steps. Your best bet will probably be to apply a layer of primer, then after it dries, the new paint.
If by top layer you mean the paper, then re-install drywall on that wall.
To paint over a dark color on a wall, follow these steps: Clean the wall surface to remove any dirt or dust. Apply a primer to the wall to create a smooth base for the new paint. Choose a light-colored paint that is specifically designed to cover dark colors. Use a roller or brush to apply the paint in even strokes, starting from the top and working your way down. Allow the paint to dry completely before applying a second coat if needed.
I do it first, before painting the wall, with a sash brush, very carefully at the top. The bottom doesn't matter too much as I yet have to paint the wall, but I usually feather it out over 2-3 inches.
The inside top surface of a room is typically referred to as the ceiling. It is the horizontal surface that covers the upper boundary of the room. Ceilings can be finished in various ways, such as with paint, tiles, or plaster.
19 X 8 - (19 X 1) = You do the math.
....is the top of the foundation wall. Simple as that.