When to Use a Paint Primer &
Paint Primers - Always Necessary?
Applying another coat of paint primer before painting may seem an unnecessary burden, an extra expense and definitely more work! Why would you like to do that? This is why it is important to find the right answer regarding the way how to use paint primers.
I would say to consider this as an investment in look and durability ! For sure it will pay off at the end and will be a solid foundation for your entire project!
About Primers:
Where to Buy Zinsser Primers
They are special paints, with binding properties. Their main purpose is to ensure better adhesion of paint to the surface. Used before painting will give increased paint durability and smoother look.
Despite the common believe, they are not designed to ‘cover’ intense colors. Their composition is intended to have more efficient filling and binding properties, and not much of pure hiding properties... Of course, some deep, intense, tinted high–hide primers may help, while using a shade close to your finish deep color. Keep in mind that you can always ask the paint store to tint your primer close to your shade.
When to Use Them:
- New walls and ceilings, when no paint was applied before
- Walls and ceilings already covered with oil or alkyd based paints and you are planning to use latex or acrylic
- To achieve true color, when your new paint is very deep and intense, or is using a clear base, is good to use a tinted primer
- Water stained walls or ceilings
When Not to Use Them:
Only if you are re-painting a surface with a similar product and color, for example: latex on latex.
What If I Don't Use It When is Recommended?
Your painted area will peel and scratch easily and the only way to fix it is to remove ALL the paint and start all over again… On the other hand, when you are using the right type, in a correct way, you will achieve overall quality and durability of your job. Wouldn’t you like, for example, to extend your exterior house paint up to 10 years just by using the correct steps?
Types
There are interior primers and exterior primers. The 3 basic types are Alkyd - Oil Base, Acrylic - Latex and Tinted Shellac. Each one of them has a special set of uses. All are designed to help by: - Increasing adherence between the surface and top coat
- Producing a uniform surface for painting
- Sealing porous surfaces and filling the pores
- Increasing the durability
- Creating an effective barrier against stains and moisture
- Ensuring an even- look coverage on repaired areas
Wood Paint Primer
For bare and new wood, this is mandatory. Wood is a very porous material and will absorb the solvent from paint, drying the paint prematurely.The primers available for wood are sometimes costly, depending on the specialty. Whether interior or exterior, any new wood should be primed, to inhibit tannin and knot stains, preventing rot, filling the pores, covering the wood grains and giving a smooth, even finish. Painted wood on the other hand must be cleaned, and then primed. Otherwise, the best paint will not stay too long on… If exposed to moisture, without primer’s waterproof qualities, the wood will rot.
Tip: lightly sand painted areas between applications, even after priming. This will be an easy chore and will give you a nice, professional result.
Metal Paint Primer
There are two basic types of metal primer:
Rust Paint Primer: a good metal primer is inhibiting rust, acting like a rust stabilizer. Metals, in general, do not provide a solid surface for the paint to adhere to. Once painted onto the corroded metal, turn the rust black and inert, and can be painted over within an hour.
Galvanized Metal Paint Primer: for painting aluminum, for example. A zinc chromate primer is used to add the necessary adhesion properties.
Plastic Paint Primer
Most plastic primers are based on solvents, which may be too harsh and possibly damaging.This is the reason why is important to figure out, as accurate as you can, what type of plastic is the one you need to paint. Also, testing on a less visible spot is recommended. Overall, a better adhesion will be achieved, not to say that a primer will help with a color change.
Advice: - Don’t wait to re-coat the primer with a finish coat of paint more than 12 hours; as soon as the primer is ready for painting, do it, as fast as possible. You will have a better bond between the two paints
- Always follow the instructions on the label! There are many types of paint primers, and most of them are designed to work the best in specific conditions and only with specific paints!
- When in doubt, remember all good things that a quality primer can do and … use it!
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