What Is The Difference Between Interior Paint And Exterior Paint?

The environmental performance of home decoration materials is very important to us, so we also need to pay attention to more aspects when choosing decoration materials. As for paint, it occupies a very important part in home decoration. When choosing, it is necessary to compare many aspects so that high-quality and environmentally friendly products can be selected.

Paint can be divided into interior wall paint and exterior wall paint. What is the difference between these two types of paint? How to choose? This article will give you a detailed introduction to these two aspects.

Types of paint

• Interior wall paint

• Exterior wall paint

1. What is interior paint?

Interior wall paints are paints specially used for interior wall decoration and protection. They can not only beautify the indoor environment but also protect the walls from moisture and mildew.

1.1 Main features of interior wall paint

Interior wall paint is usually environmentally friendly, scrub-resistant, stain-resistant, and mildew-resistant.

1.2 Types of interior wall paint

Water-soluble paint

Water-soluble paint is made by dissolving polyvinyl alcohol in water and adding pigments and other additives. To improve its performance and reduce costs, people have adopted various methods. There are many models, the most common ones are 106 and 803 paints.

The advantages of this type of paint are low price, non-toxic and odorless, and easy construction. Because its film-forming material is water-soluble, it will always leave some marks after wiping with a wet cloth. It is not durable and easy to turn yellow and discolor. But it is cheap and easy to construct. At present, the usage is still the largest, and it is mostly used for interior wall decoration of low-end or temporary rooms.

Latex paint

Latex paint is a kind of paint made of water as the medium, acrylate, styrene-acrylate copolymer, vinyl acetate polymer aqueous solution as film-forming material, and adding a variety of auxiliary ingredients. Its film-forming material is insoluble in water. The water resistance and weather resistance of the coating are better than water-soluble paint. It leaves no marks when wet and wiped. There are different decorative types such as matte and high gloss.

Because it has fewer colors, the decorative effect is similar to that of grade 106, and the price is much higher than that of grade 106 paint, it has not been widely recognized so far. But these two types of paint are completely different grades. Latex paint is widely used abroad and is a very promising interior wall decoration paint.

New powder coatings

This new type of powder coatings includes diatom mud, seaweed mud, activated carbon wall materials, etc., which are currently more environmentally friendly coatings. Powder coatings are directly mixed with water, and are constructed with the help of special processes and combined with special molds. They are deeply loved by consumers and designers.

Water-based imitation porcelain paint

Water-based imitation porcelain paint has a delicate, smooth, and elegant decorative effect, and is not expensive, but the construction process is complicated and the wet rubbing resistance is poor.

Water-based imitation porcelain paint (environmentally friendly formula) contains calcite powder, zinc white powder, light calcium carbonate, double fly powder, and gray calcium powder. It is characterized by using a mixed colloidal solution of water-soluble methyl cellulose and ethyl cellulose as a solvent for the mixed powder;

The main proportions of the components in the imitation porcelain material are 20-25 parts of calcite powder, 5-15 parts of zinc white powder, 15-25 parts of light calcium carbonate, 20-35 parts of double fly powder, 15-25 parts of gray calcium powder, 70 parts of distilled water, 0.6 parts of methylcellulose, and 0.4 parts of ethyl cellulose. An appropriate amount of titanium dioxide can be added to the water-based imitation porcelain paint formula, and no irritating odor or other harmful substances will be generated during the preparation and construction process.

Multicolor paint

The film-forming substance of this paint is nitrocellulose, which is dispersed in the water phase in the form of oil-in-water, and a variety of color patterns can be formed in one spray.

Liquid wallpaper

Liquid wallpaper is a popular interior wall decoration paint with various effects, arbitrary color modulation, and customization. Compared with water-based imitation porcelain paint, it has super friction resistance and anti-fouling performance, simple process, and can be constructed using special molds.

1.3 How to use interior paint?

• First, confirm whether the substrate meets the coating requirements before painting;

• Secondly, the painting should be done between 5 and 35°C, and the air humidity required for painting should be less than 85%;

• Then, choose the appropriate construction method and the appropriate construction tools, and operate according to the recommended construction process;

• Finally, control the painting interval, and the next coat can be painted only after the recoating time is reached. Too short recoating time will cause the base layer to dry slowly and wrinkle; one-time coating should not be too thick.

In addition, do not mix with organic solvents, acids, alkalis, oils, and other chemicals. During construction, air circulation should be maintained, and the paint should be kept away from direct sunlight and heat sources. To avoid contaminating the skin and eyes or inhaling excessive paint mist, please use protective equipment such as masks and gloves. If the eyes are contaminated, rinse them immediately with plenty of water and seek medical attention. Finally, please store it out of the reach of children.

2. What is exterior paint?

Exterior wall paint is a decorative paint used to protect and decorate the exterior wall surface of a building. One of its important indicators is that it needs to have excellent UV resistance and not change color under long-term exposure to sunlight.

2.1 What are the types of exterior paint?

Exterior wall paints can be divided into various types according to their composition and properties, including latex paint, oil paint, acrylic paint, silicate paint, etc.

2.2 The main features of exterior wall paint

Exterior wall paints are usually environmentally friendly, easy to construct, and have rich colors, so they are widely used in the decoration of building walls.

2.3 How to use exterior wall paint?

First, pre-treat the exterior wall and apply one or two layers of exterior wall putty;

Then, during construction, apply a layer of exterior wall primer first, and then apply a second layer of oil-based exterior wall paint.

3. What is the difference between interior paint and exterior paint?

Functionally, exterior wall paint has both protective and decorative effects, and its paint has rich colors and good color adjustability. Another protective function is that since the exterior wall is not shielded and needs to withstand wind and rain if the exterior wall paint is used improperly, it is easy to cause powdering, cracking, and other phenomena.

Interior wall paint, like exterior wall paint, needs to have certain protective and decorative functions. Not only that, it must also be easy to apply and have good environmental performance. Secondly, it must have strong covering power and rich colors.

4. How to choose interior and exterior paint?

When buying interior and exterior wall paint, you need to pay attention to more than just the price factor. Generally speaking, the more expensive the paint material, the better the quality.

Secondly, you need to pay attention to quality issues. It is recommended to choose products with a good reputation and high brand awareness.

When you purchase, you need to check its material composition and whether it has relevant test certificates.

Under normal circumstances, when the paint is applied to the wall, its color will be affected by the reflection of light, and the color presented will generally be darker than the color on the color card, so we can choose a slightly lighter color to paint.

We can judge whether the interior and exterior wall paint has excellent environmental performance by looking at its environmental indicators, rather than relying solely on the smell.