The primer you need depends on:
- What you’re priming (wood, drywall, plastic or metal)
- Whether you’re working inside or outside
- What you want to accomplish.
The right primer will:
- Improve adhesion, or the ability of the finish coat of paint to stick to the surface.
- Fill imperfections to create a smooth surface and make the finish coat more attractive and durable.
- Marry two different types of paint, such when you want to use a latex paint over a surface previously painted in an oil base paint.
- Enable you to make a significant color change. (For maximum coverage, tint the primer to the color of the finish paint.)
- Reduce absorbtion of moisture to protect the item being painted, especially wood.
- Retard the development of rust.
- Block tannin, grease, wax crayon, water damage, rust or smoke stains, etc. from bleeding through the finish paint.
- Retard odors from nicotine, fire damage, etc.
- Evenly seal the drywall paper and taped areas so that paints with a sheen will have a more uniform, attractive appearance.
- Cleanable to a greater or lesser extent, depending on the type of paint and the sheen