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Exterior Painting – Correct Way to Paint the Exterior Walls


If you don’t paint the interior wall correctly. Problems may occur later and it may be necessary to repaint within a year. It is better to know the correct way before applying the exterior paint coat so that it won’t get damaged before time. So here are the main points about how to do Exterior Painting on the wall. 

In This Article

What happens if I don’t apply it correctly?

There are many types of paint that can be use for exterior wall painting. At the same time, each has different durability and characteristics.

For example, paints with a durability of 15 years, or a self-cleaning function, etc. can use according to conditions and wishes.

But, it is necessary to paint properly for those effects. If you don’t apply it, problems such as dullness, peeling, swelling, are inevitable. What happens in such a case is, of course, to request repainting work. What happens in such a case is, of course, to request repainting work.

In exterior wall painting, it is no exaggeration to say that one method of painting “determines the reliability of the painter.”

Main causes of improper paint application

So what are the symptoms if something goes wrong with the exterior wall painting? It is said to be typical 4 the one case I try to pick up.

Uneven gloss

If painted coats correctly, the gloss will be uniform. However, if there is a problem with the painting method, the gloss will be uneven.

The cause may be that the amount does not apply to the same wall surface. The length of the hair of the rollers, which is a painting tool, is not the same.

White grains emerge on the paint film

The paint film covers the surface of the paint and is the “most noticeable part” when the outer wall being painting.

If there is a problem with the application method, white spots will appear on the coating film. This condition is more likely to occur when affected by moisture (rain or condensation).

The paint peels off

It is a symptom called “peeling” and is the most common problem with exterior painting on the wall. There are various causes, but the amount of paint is using and the dilution rate is related.

Expansion of coating film

It has the characteristic that a flat wall surface looks bulging while the coating film looks like blisters. As with peeling, most of them are happening by the amount of painting and the dilution rate.

What are the benefits of the two major exterior painting methods?

For the paint to be effective, it is necessary to properly use the painting tools in addition to the standard coating amount and dilution ratio. 

The Fill is mainly sent to as the “spray method” and the “roller method” the second is one of the types that exist. However, roller method to one of the method it’s also a little difficult.

First, understand the current status of the two methods

First of all, the spraying method requires a large initial investment for the trader because the price of the spraying machine is high.

In addition, you require a certain level of skill, so in recent years there has been an increasing tendency for companies to adopt only the roller method. 

However, depending on the type of paint, there are cases where only the spraying method can be used.

On the other hand, if you are a painter who can only use the roller method, the paints, and finishes that can be used may be limited. 

Since the current of the outer wall paint industry, there is such a situation, 2 to ask the house painter to adopt a single method might be a good idea.

Characteristics and merits of the roller method

The roller method has the characteristic of reducing unnecessary costs because the paint is less likely to scatter. Also, if you are a craftsman who is familiar with how much paint must be using with roller, you can expect an even finish. 

If the outer wall has a lot of unevenness, you can use a roller with long hair. Since paint tends to collect indented areas, it is common to use a brush together.

Characteristics and merits of the spraying method

The appeal of the spraying method is, after all, the quickness of the finish.

In addition, since it uses a “sprayer”, which is a special injection type tool, it is possible to paint a wide range at once. 

In addition, it also has the features of being able to apply complex patterns, creating a profound atmosphere, and making repair-marks difficult to understand. 

However, since spraying craftsmen are required to have high skills, it is undeniable that the finish depends on the craftsman’s experience.

As with the roller method, it is common to use a brush together in areas with many irregularities.

Also, pay attention to the correct way to paint the outer wall!

Exterior paint on wood, brick does not have to be the correct method. Depending on the paint, some can only be used with either method. 

Not only the merits of the construction method, but also the paint that can be produced by each construction method must be confirmed, and the paint must also be protected. What exactly is that?

To apply correctly, keep the standard application amount and dilution rate.

As you can see from the four cases mentioned above, the “standard coating amount” and “dilution rate” are largely related to the cause of the failure to apply correctly.

The standard coating amount/dilution rate is the standard value when using the paint specified by the paint manufacturer. 

If the standard is met, the original effect of the paint will be done, and if the standard is not met, problems such as “uneven gloss”, “expansion”, and “peeling” will occur.

What is the standard coating amount?

For paints, the “standard coating amount” by the paint manufacturer is clarified. Paint cans containing about 18 liters. It is a guideline for “how much coating area can maintain the performance of the paint?” It is the standard coating amount. Also, check into the Painting calculator.

In other words, if the amount is less than the standard amount, the original effect of the paint will not be exhibited easily. If it is more than the standard amount, the paint will be wasted as much as the thickness increases. Even if it is applied thickly, the performance will not increase. 

No On the contrary, by making it thicker, problems that the manufacturer did not anticipate may occur. Since the standard coating amount can be confirmed on the website of each manufacturer. If the outer wall is paint in a state where it is less than the coating area. It can be used as a “standard for judging whether or not it is omission”.

Relationship between dilution rate and stirring

When using paint for exterior painting. When diluting, water or thinner is use according to the properties of the paint, and the optimum dilution ratio is set by the paint, such as 5 to 10%. 

As with the standard coating amount, if the dilution ratio does not meet the standard value, the original characteristics of the paint will be weakened.

In addition, the work of stirring is indispensable after dilution. Stirring is the process of stirring the paint after diluting it, using a tool such as a large type of hand mixer called a stirrer. 

No matter how much water or thinner is injecting, the entire paint will not be diluted unless it is agitated. So it cannot be said that the paint is in the proper condition.

Only with agitation to make the paint concentration uniform can it be diluted correctly.

What if something goes wrong after painting?

Let’s check immediately if there are any problems when the work is complete. However, defects do not always occur immediately.

The defect will be noticed one year after painting the outer wall

If the exterior wall paint is peeling off due to the negligence of the painter, such as painting without observing the standard coating amount and dilution rate, or an inexperienced craftsman implementing the spraying method, additional work of repainting will naturally occur. 

However, problems such as peeling, expansion of the coating film, cloudiness, and uneven gloss do not occur immediately after painting the outer wall.

Check the warranty carefully

In that case, it is important to check “Disclaimer” and “Matters not covered by warranty” in addition to the warranty period. 

In addition, the warranty period set by the exterior painter is generally matches to the useful life of the paint used when painting the outer wall. For example, about 10 years for silicone-based paints and about 15 years for fluorine-based paints.

Find a reliable exterior painter in Toronto

It is practically difficult for the general public to grasp the correct painting method at the painting site.

Moreover, even if it is a cut-out work, it is difficult to judge that it is a “painter’s fault” if you see the paint peeling off one year later.

Since this time is specialized in the “painting method”, it can be used as a guide as it is at the time of quotation or painting contract. 

However, choosing a reliable Painting Contractor in Toronto can offer the best quality exterior painting services. Where you won’t need to worry about the wrong painting method.

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