Exterior Painting Guide - Treated, groundwork, paint and color selection

The exterior wood surface is constantly exposed to moisture stresses and the sun's UV radiation. In addition, the geographical location of the buildings, the directions and the construction methods are increased by the strain. The surface treatment agent protects the wood from moisture, sunlight and weathering, and slows down potential fungal growth. UV radiation of the sun causes the untreated wood surface to gray and flutter.

Moisture variations cause tension, wetting and drying in wood, which gradually lead to cracking of wood. Moisture is also harmful because it creates a medium for mold, blue and decaying mushroom growth. Mold sponge grows on the surface of the tree and stands out in dark spots. The blue sponge may extend deep into the tree and convert the tree into a blue gray. Mold and blue mushroom growth does not weaken the hardness of the wood, but the decaying sponge makes the wood unusable over time.

The better the groundwork and pre -treatments are done, the better, higher quality and more durable surface treatment. Pre -treatment of the substrate improves the adhesion and durability of the surface and extends the service painting interval. It is best to start pre -treatment of old exterior wood surfaces by checking the condition of the tree actually. Wood or decaying wood will not make the paint or surface treaters better. The unprotected wood surface is quickly exposed to the effects of the sun, water and fungi, making the wood surface gray and purse. On such a surface, the paint does not stick to.

Cleaning

Carefully pre -treatment of the surface is very important because the dirty surface does not stick to the dirty surface. The surface must always be cleaned of possible dirt, dust, mold or other impurities. The exterior surfaces can be cleaned with a light dust brush or water flushing, but the best -grabbed and stubborn dirt on the outside surfaces comes off with a suitable detergent, such as Uula paint detergent or Uula mold detergent. Often, just washing alone may be enough to renew the paint surface if the paint surface is in good and intact. After washing, the surface must be allowed to dry properly before painting.

Removing a loose and scaly paint

All loose, scaly and cracking paint must be removed. If the old, poorly attached paint remains on the wood surface, it will also cause the new paint to come off. It is a good idea to remove the paint by scraping or grinding. Thick and old paint layers can also be removed with Uula paint remover , according to the instructions. The wood surface to be treated is cleaned of dust and loose material.

Priming or a primer painting

The surface to be painted is cleaned of dust. If the old wooden surface is fluffy, it is a good idea to wash Uula with paint and grind to ensure adhesion. If the old wooden surface is moldy, it is washed with Uula mold was washed. If the wood surface is previously painted, all the loose paint will be removed and, if necessary, the wood -clean surfaces will be primed with UU ULA, according to the instructions. A new rough, untreated wood surface is painted with an outdoor paint if the purpose is to make a topcoat with a covering paint. Under the translucent surface treatment agents and paints and traditional cooking paint, the primer is not used. The new, smooth planed surface must be roughened by grinding before priming to ensure adhesion.

When should you paint?

The best exterior painting time is from May to the end of August and the best painting weather is cloudy. The painting must not be made in the rain, in direct sunlight or on a damp or sun -heated surface. The humidity should be less than 80% and preferably at least +5 degrees. The surface to be painted must be dry and the moisture of the wood is less than 15%. After the rain, the surface to be painted must be allowed to dry properly before starting the painting. Oil paints are characterized by slow drying, which is worth considering when designing painting. It is always a good idea to always do painting and handling the terraces and docks, taking into account natural conditions.

How can you recognize the old quality of the paint?

It is a good idea to look at exterior paints and surface treaters in advance. When designing maintenance painting or other surface treatment, it is a good idea to find out the previous processing agent or paint to ensure the adhesion and stability of the paint.

• The old paint painted with oil paint is chalked. It may leave color in the fingers when hanging. The oil paint surface cracks screen and, when bent, clicks across.
• The paint that has been removed from the old paint painted with water -borne acrylate paint is flexible and unbroken. The cracks in the paint surface are formed parallel to the causes of the wood.
• Cooking paint (traditional red paint) can be identified from a floury surface. In addition, the paint surface is porous and dim. When touching it, the color is left in the fabric dipped in fingers or water.

Is one painting enough?

The number of paintings depends on many different factors, such as the paint's own feature, whether a opaque or translucent paint is used, whether it is a first painting or a maintenance painting, whether the purpose is to change color or how much the groundwork is affected by the surface to be painted. If the old paint surface is in good condition and does not flake and service painting in the same shade as before, one painting may be sufficient. In the case of a first painting or changing the shade, it is a good idea to be prepared for two paintings. It is very important to consider the own recommendation and painting instructions for the paint type you use.

How much paint is needed?

Paint sales are influenced by the surface to be processed and its condition. The absorption of the paint is influenced by the porosity of the wood, the degree of drying of the wood and the roughness of the wood surface. The paintings also affect the amount of paint. Different paints and surface treatment agents mention the average amount of paint, which, under normal circumstances, is sufficient for different surfaces and paint grades. Our paint counter will help you assess the number of goals you need. Enter the material to be painted in the counter and its area to get enough paint in liters. Our paint calculator can be found on the product page of each product.

The choice of colors sometimes causes great difficulties because there is almost unlimited choice in shades. If the choice is made from small color models, it may be difficult to see what the shade really looks like on large surfaces. Sunlight and shadows also change the color observation outdoors.

When choosing a color, it is easiest to get started on whether the previous color has been comfortable and whether it needs to be changed. The milieu, the location, age and style of the building also influence what kind of colors the building is used to. Therefore, it is a good idea to limit your own or recommended colors and make a test painting on a larger surface to understand the color of the color. It is a good idea to invest in test color jars, as it is cheaper to change the color in the direction of the test painting than the entire house painting.

When choosing colors, you can rely on your own color preference or ask for color ideas or suggestions from designers or industry players. From Uula dealers or advice from uula.fi / Contacts, you can get help choosing both paint and shade. On our site you will also find color combination ideas to support the color choice. Also, be sure to check the possible color change limitations for external painting.