Reasons and how to avoid the appearance of paint stains, how to remove them
The cause of paint smearing is the application of an uneven coat and variations in thickness on different areas of the treated surface. Structural irregularities resulting from improper application are called paint shading. It alters the appearance of the treated surface, makes repairs sloppy and requires touch-ups. It is possible to avoid the formation of burrs only if you follow certain rules.
How do spots and spots occur?
Stains occur due to a combination of several factors:
- Lack of thinner. Some formulations require no more than 10 percent dilution. Other paints are too thick and require a 20 percent thinning.
- Control of the absence of cover. Although the manufacturer indicates on the packaging how much thinner to add, each case is different. After preparing the mixture, it is recommended to apply a test coat to ensure that the proportions are correct.
- The application stops. This means that the painting is done in several passes. This technique causes stratifications, as well as spots of different thicknesses.The boundaries between the dried layers form a crust which results in pebble grains.
- The presence of a roller with long hairs. Long hairs on the instrument cause numerous ridges to appear. It is recommended to use it when working on a textured surface. In this case, the long pile ensures a strong and stable grip.
- Lack of lighting when painting. Often the lack of light is a bad joke for painters. They don't see mistakes that can form stains.
A painting error is the hope that a coat of paint will hide minor irregularities or imperfections. This misconception leads to the fact that poured paint exposes all defects.
Information! After painting the surface, check hard-to-reach places with a flashlight. Highlighting helps to see flaws and deal with them in a timely manner.
How to avoid their appearance
Stains appear on surfaces requiring multiple coats. The risk increases if a larger area has to be treated.
When painting furniture
Furniture is often painted with paint. The risk of scratches is particularly high on vertical cabinet walls. The appearance of stains on furniture, measures to eliminate the problem:
| Problems | Disposal methods |
| thick coat of paint | Application of several thin coats at 1 min intervals. Hold the spray gun, spray can or spray gun at an optimal distance at a 90 degree angle. |
| Lack of grip | Primer and surface sanding. Use to prime quality compounds. Complete drying of the primer coat. |
| Heavy stains, liquid paint | You can not add the entire volume of solvent to the mixture so as not to make the composition liquid.It is recommended to add it gradually to obtain a suitable consistency. |
When painting a car
Repainting a car is connected with the peculiarities of the coloring composition. It should offer a firm grip and a smooth finish.
Possible problems when painting a car, solutions:
| The reason that caused spots and stains | Possible solution |
| Paint runs due to lack of adhesion | Preparation must be done before painting. The surface is treated with a primer, which will provide adhesion. The prerequisite for creating a preparatory layer is the use of a grinding machine or sandpaper. With their help, all visible defects are removed. |
| Slow thinner present, too thinner | The paint is diluted gradually, adding a few milliliters of thinner, so as not to create a liquid mixture that is unable to promote the formation of a coating. A poor quality thinner prevents the formulation from creating the required structure. |
| Violation of the rules for observing the optimal distance from which the paint is applied | Excessive approximation or separation creates underpressure or overpressure, produces an uneven layer or incorrect layer thickness. |
| Thick layer | Coating 2 or 3 times creates a thick layer that causes smudging |
| Spray gun settings violated | Recommended factory settings |
| Temperature inconsistency | A cold car does not accept hot paint well. Cold paint does not adhere well to the surface, so it is important to approximate the two temperatures in terms of basic indicators. |
Reference! The optimal distance, which is necessary for working with the ball, is considered to be a distance of 15-20 centimeters.
Effective tools to eliminate
Is it possible to do something if the spots have already appeared - this question requires an immediate answer. Repairers use special tools to fix the problem. Tool list:
- Micro-cut. This is a device designed to remove stains. The height indicator can be adjusted independently. The cutter is made of high quality steel, the cut creates a clean chip.
- Mini-file. A double-sided file allows you to cut and polish layers at the same time. Both sides are made of durable elements, ensuring fast and high-quality work.
- Knife. A special knife with a sharp edge provides a clean cut.
- Cutter. This is a knife with a sheath and a rope from the manufacturer Mirka. Cut out a layer of varnish or paint at the base with a cutter.
- Defect removal bur. The cutter is made of solid tool steel. It is used for its intended purpose only when the diaper is completely dry.
How to properly remove stains
The effectiveness of stain removal depends on the properties of the surface. The texture of the material is important when choosing the tools with which processing is carried out.
On the wall
It is difficult to avoid smudging on vertical surfaces. If they occur, it is recommended to use one of the following methods:
- areas of streaks are cleaned with sandpaper;
- a thick layer is cut with a knife or cutter, then cleaned with sandpaper;
- non-coarse lamination is cleaned with construction sandpaper soaked in a thinner solution;
- a loose formation is sprayed with an aerosol detector before stripping - this technique will facilitate the work and soften the load.
On the tree
The defects that appear on the tree are cleaned with sandpaper and washed with warm water and soap. After that, the surface must be completely dried, wiped with a damp cloth and dried again. Applying the next leveling coat is only possible when all causes of staining have been eliminated. Wooden surfaces must be painted respecting the temperature conditions.
On the ceiling
On the ceiling, stains and layers are removed in one of the following ways:
- With a spatula. The tool helps gently remove buildup. After that, the ceiling is primed before the next painting.
- With a sponge. The problem area is treated with a voluminous wet sponge, changing the water.
- With paint. Some light stains can be covered with a water-based paint.
Acrylic paint
Acrylic paint is a composition based on polyacrylate. The water-dispersed base allows the use of various solvents for acrylates. The peculiarity of the acrylic-based coating is the creation of strong adhesion to the surface material.
The appearance of stains on acrylic can be the result of temperature changes during painting, if other conditions are met.
Stains on acrylic are removed with a special plane designed to remove defects. Then they begin to polish the surface. Polishing is carried out using a special fine polish.
Additional tips and tricks
To avoid the formation of defects, professional painters recommend following the rules of painting:
- To see the unpainted areas, to follow the formation of streaks, the painting process is carried out in daylight. Artificial evening lighting distorts reflections.The next morning, after the evening painting, it looks like the work was done blind.
- Before starting work, check the level of humidity. A humidity reading below 45 and above 75 percent is a marker to stop paint jobs. With an unfavorable humidity level, it is impossible to predict the result of the work, it is not known how the material or coating will behave.
- When painting walls, experienced painters prefer to abandon stepladders. They use rollers with extension brackets. This technique avoids the loss of surface sensation when descending or climbing stairs. The layer will be smoother and thinner when the scale is dropped.
- It is recommended to squeeze the roller well before using it as directed. For this, there is a special rib on the device designed for painting. The roller is rolled up and down along the edge to shake off excess drops.
- Banding should be avoided. This creates the risk of forming boundaries and overlapping the material. The recommended scheme for painting a large area is alternating W and Z lines.
A prerequisite for a good renovation is the choice of quality materials. Poor quality paint will not create a smooth, smudge-free finish.