No, you don't have to but it certainly looks better. If it's in a store room or something like that, it's not necessary
It is not necessary to use a primer for interior walls, but using one helps with adhesion and smoothness of the paint.
Apply a coat of exterior paint over the interior paint to protect the finish and to discourage mildew growth on the paint film.
It is best to use an exterior primer outside, rather than an interior. While, the interior paint will work, it does not have the same protection such as UV protection, and fungicide protection that is found in exterior paints.
Sure. You can mix them. Why would you? It will not help prime the walls or wood. The primer coat needs to be applied separately to be effective.
Yes, you can.
Either oil or latex primer can be used over interior latex paint.
It is not necessary to use a primer for interior walls, but using one helps with adhesion and smoothness of the paint.
Apply a coat of exterior paint over the interior paint to protect the finish and to discourage mildew growth on the paint film.
It is best to use an exterior primer outside, rather than an interior. While, the interior paint will work, it does not have the same protection such as UV protection, and fungicide protection that is found in exterior paints.
Sure. You can mix them. Why would you? It will not help prime the walls or wood. The primer coat needs to be applied separately to be effective.
I would use a good primer first.
I wouldn't. I don't think they would have called it "interior paint " just for fun.
Yes, you can.
Yes you can, as long as the red finish paint is compatible with the tan wall. Acrylic and latex paints can't be applied over an oil based paint without a primer. A tinted primer can be used if you are not sure. Plus, a tinted primer will make the red paint cover better.
Latex primer is undoubtedly the quickest drying paint.
I would probably put a primer coat on first. A good primer is Kilz, which will also cover stains. It is worth the money to buy a good brand of primer since it will save you work and make your new paint look its best.
No, you buy the primer separate and paint with it first, let it dry then get the paint and paint over the primer. There are several paint applications where the paint can be used as a primer, and this is called a self-priming paint. In addition, many paints are marketed as a paint and primer in one, however, that refers to its ability to adhere well to a surface and to cover the previous coat. In more difficult priming situations, like staining or painting with a very dark color over a light color, it's recommended to use a dedicated primer followed by a top coat.