The type of paint you should use will depend on the surface you are painting and the desired finish. For example, you might use a different paint for a metal surface than you would for a wooden surface. Some common types of paint for commercial and decorative use include:

Latex paint : This is a water-based paint that is easy to clean up and dries quickly. It is a good choice for most surfaces, including walls, ceilings, and trim.

Oil-based paint : This type of paint is more durable and resistant to water, making it a good choice for high-moisture areas such as kitchens and bathrooms. It is also resistant to scuffing and fading, making it a good choice for high-traffic areas.

Acrylic paint : This is a water-based paint that is fast-drying and has good coverage. It is a good choice for a variety of surfaces, including wood, metal, and plaster.

The amount of paint you need will depend on the size of the surface you are painting, the type of paint you are using, and the coverage of the paint. It is a good idea to calculate the total square footage of the area you are painting and then consult the paint manufacturer's coverage recommendations to determine how much paint you need.

The lifespan of the paint will depend on the type of paint you are using and the conditions in which it is applied. Latex paint has a shorter lifespan than oil-based paint, but it is generally easier to clean and maintain. Proper preparation of the surface and proper application of the paint can also affect the lifespan of the paint.

In most cases, you can paint over a previously painted surface as long as the old paint is in good condition. However, it is important to properly prepare the surface before applying new paint. This may include sanding, priming, and cleaning the surface. If the old paint is chipped or peeling, it is best to remove it before applying a new coat of paint.

Proper preparation of the surface is key to ensuring a smooth, professional-looking finish.

Steps to prepare the surface before painting may include:

Cleaning : Remove any dirt, dust, or debris from the surface.

Sanding : Sand down any rough or uneven areas on the surface.

Priming : Apply a coat of primer to the surface to help the paint adhere better and provide a more even finish.

Repairing : Fill any holes or cracks in the surface with spackling compound or caulk.

The amount of time you should wait before applying a second coat of paint will depend on the type of paint you are using and the drying conditions.