How to choose a plastic primer correctly

How to choose a plastic primer correctly Primer for plastic and the peculiarities of its choice

Dyeing plastic products is always a big problem. The fact is that on an ideally smooth surface of polymer-type materials, the paintwork is poorly adhered to, and after a while after application, bubbles appear on the paint and they disappear.

So that in the future you do not regret wasted time and money invested, it is advised to process plastic with primers, and then high-quality painted polymer materials will delight you with their durable layer for a long time.

It is worth considering the peculiarities of the primer for plastic.

General information

The difference between plastic and other materials

The main differences between plastic and other materials, for example, concrete or metal, include the following indicators:

  • Weak level of adhesion (that is, adhesion) with varnishes and paints.

  • Light weight.
  • Excellent plasticity of the material.
  • Anti-corrosion.
  • Excellent thermal insulation properties.
  • High degree of resistance to atmospheric precipitation.

  • Excellent noise reduction performance.
  • Resistance to aggressive environments.

Plastic products undergo an aging process over time, and for this reason the application of paint and varnish coatings will have a positive effect on increasing the service life.

Choosing a primer for plastic

When choosing a primer for coating plastic products, pay attention to the compatibility of the primer and the coloring compounds. They should not be the same in composition, as well as in scope.

It should also take into account the properties of plastic, or rather the fact that the material can change under the influence of deformation. For example, when a plastic window sill breaks, cracks and creases appear on its painted surface. It is important to know that the primer and the paintwork must be equally responsive to possible deformations.

Varieties of primers

Primers for plastic surfaces are classified according to the method of application, composition and degree of readiness.

According to the composition, the mixture for priming can be divided into the following types:

  1. How to choose a plastic primer correctly Acrylic type blends.

    Polyacrylic primers are non-toxic, odorless liquids with high adhesion properties, and they are also fast and easy to apply. Acrylic primer creates a strong and durable coating on the plastic product.

  2. Alkyd compounds. The main components of these mixtures will be alkyd resins, pigments and fillers. Due to the versatility of the primer mixture, it is used not only for plastics and materials, but also for metals.

    A primer with a pungent and distinctive aroma that will form a strong and durable coating after application.When working with alkyd-type primers, attention should be paid to the safety of work.

  3. Epoxy primers. These are two-component formulations that are made on the basis of low viscosity resins, coloring pigments and fillers. The primer should be mixed with epoxy hardeners prior to use.

Depending on the method of application, the mixtures for priming and processing of plastic products will be subdivided into a filling type, which is used to increase adhesion, as well as to fill in the microscopic relief, as well as finishing compositions that are applied for coloring ...

Protective primer for plastic

Primer for plastic for painting of the tread type are complex mixtures that consist of 90% of dusty powders of magnesium, zinc, aluminum, lead and binding components - epoxy resin (10%). The primer should be applied to plastic elements, and as a shell, it will protect the structure from aggressive environments and probable scratches.

Such a tool is often applied before painting on plastic parts of cars. If the integrity of the protective layer of the primer is violated, zinc oxides will create a reliable barrier in the form of a thin film and prevent oxidation of the metal base. Protective primers for plastic products are presented as suspensions with the EP-57 marking and other mixtures of a similar type.

Adhesion primer

In order to improve the adhesion of plastic products with coloring compounds, use one-component quick-drying primer solutions. The construction markets have ways to present a wide range of similar primers with different technical characteristics.

But, despite the different brands of trade marks, adhesive-type primers have many common features - they all can be attributed to professional products that are designed for further coloring of polypropylene and plastic products with base and acrylic enamels. Applying an adhesive type primer requires careful preparation of the surface - it should be cleaned of dirt and degreased, matted with an abrasive cloth, then degreased again and only after perfect drying can the priming process begin. The product should be applied in one or even two layers, while maintaining a time interval of 5 to 11 minutes.

Alkyd composition for plastic

A special alkyd primer is used for application to various plastic products, and an example is:

  • Window frames.
  • Plastic window sills.

  • Rest benches, lanterns.
  • Children's outdoor playgrounds.
  • Elements of the drainage system.

The alkyd primer will be a blend of special purpose alkyd modified resins, fillers, pigments, inhibitors, special additives and solvent.Such a complex composition would be in the class of highly adhesive specialty primers which are methods of preventing the appearance of cracks in the coating and the likelihood of shedding of the applied paintwork.

The alkyd primer will not only increase the adhesion of the surface made of plastic and paintwork, but also hide small defects in the form of small scratches, and will also protect parts from the negative effects of paint.

Acrylic mixture

Acrylic primer for plastic differs from other priming agents in its unique ability to increase the degree of adhesion of all types of plastic products.

Its distinctive properties will be:

  • The appearance on the surface of a special protective film that can create a reliable barrier to mechanical and chemical damage.
  • The product is ideal for covering products that are used outdoors and are constantly exposed to direct weather.
  • The primer is not afraid of temperature extremes, and even with negative rates in the winter season, such negative effects as cracking and peeling of the painted surface will not appear.

As a good example of an acrylic primer, we can name the Kudo brand spray enamel primer, which is sold in a completely ready-to-use form and has a large color palette. Acrylic primer mix can be applied to a large area very quickly, and the aerosol can contribute to a low and cost-effective material consumption per square meter.

Process details

How to apply primer to plastic

Before how to apply a primer to a plastic element, a number of work should be done to prepare the base, clean and degrease the surface. It is recommended to pre-process the base of the glossy type with sanding paper to matte.

Step-by-step instructions for performing work:

  1. How to choose a plastic primer correctly So, the first step is to apply quality natural fiber brushes or spray, primer evenly in thin layers.

    For a full coverage, it is enough to simply apply just one covering layer.

  2. The second step will pay attention to the estimated drying time of the layer, and for the first it will be 1 hour. When you are sure that the coating is completely dry, you can start applying a second coat.
  3. The third step is to level and matte the painted surface twice in a row.
  4. The fourth step is to thoroughly dry the product.

    It is unacceptable to paint the surface on a wet primer layer.

  5. The fifth step is to wipe the completely dry product with a special napkin that has been soaked in solvent.

After completing all the steps, you can proceed directly to painting the product.A prerequisite for high-quality priming can be considered the performance of work in the temperature range from +5 to +26 degrees, and the relative humidity should not be more than 80%.

How to remove the primer from plastic

When performing repair work, you should take all possible measures to protect plastic items from paint and varnish materials - plastic window sills, doors , countertops.

Windows should be covered with a thin PVC film, sheets of old newspapers or even cardboard. But what if, after all, the primer composition gets on the plastic, because its cleaning is a huge problem?

There may be such methods:

  1. Using home remedies such as vinegar essences. The effectiveness of such a tool is quite high and makes it possible to quickly clean plastic from primer stains. But here it should be remembered that the vinegar essence emit harmful vapors and for this reason a respirator and protective gloves should be used. The room should be well ventilated, and the product should also be applied to a rag or sponge and the stained plastic should be thoroughly cleaned.

  2. You can try to clean the stuck-on stains with the same type of primer, and also abundantly moisten the dirt and quickly wipe dry.
  3. There is another option where it is proposed to cover the stains from the primer on the plastic with a wet rag and leave it for a couple of hours. The primer will begin to swell and can be easily cleaned off.
  4. The plastic surface can be cleaned with a fine-grained abrasive sponge, pre-moistened with water.
  5. Application of a cleaner for polyurethane foam or gasoline, industrial alcohol and even thinner.

  6. Primer stains on windowsills and windows can be easily removed with Mister Muscle Liquid.
  7. Primer marks can be removed with plenty of baking soda.

In some cases, it will be advisable to use a steam cleaner. In the end, I would like to note how important the priming process is. With the help of a properly selected and applied composition, you can make a high-quality coating of plastic products.

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