How to Fix PAINT CRACKING – SINNEK
Cracking is a paint defect that creates an incorrect finish or protection of the surface against external agents.
This video shows its most common causes and how to solve this paint defect.
Paint Cracking, also known as paint crazing, is the partial or complete cracking of the repaired surface.
This paint defect becomes visible especially during the inspection phase of the vehicle, after the finish paint has dried.
The paint cracking appearing on the surface may have different widths and lengths, and may be arranged in different directions, resulting in an uneven and non-uniform surface.
Let us look at some of the causes that lead to the appearance of cracking and their possible solution:
1. Incorrect paint preparation.
2. Changes in room temperature.
3. Paint layer thickness.
How to Fix SANDING MARKS – SINNEK
Sanding marks are a painting defect that usually occur due to an incorrect sanding and preparation of the intermediate coats. This video shows its most common causes and how to correct this paint defect.
What are sanding marks in automotive paint?
Sanding marks in paint are a set of grooves or scratches that have not been coated or filled by the paint coat. This defect usually appears below the finish.
Sandpaper marks result from too coarse sanding in the preparation areas or lack of paint filling and levelling power.
These marks appear as a result of a decreased coat thickness during the drying process.
Causes:
1. Choice of abrasive grit size
2. Preparation of the intermediate coats
3. Observing the drying times
4. Lack of layer thickness
SAGGING RUNS PAINT DEFECT: How to Solve – SINNEK
How to prevent paint sagging (runs) is one of the questions that every bodyshop professional has considered at some point.
This video shows all aspects to consider to correct this defect.
Sagging, also known as paint runs or paint sags, is a paint defect that occurs mainly on vertically oriented parts, such as doors, flaps or bumpers, and can occur in both the intermediate coats and in finish paint.
The form in which they appear on the surface is as paint run-off, generally caused by an excessive amount of product.
This excess paint tends to drip downward, due to the effect of gravity when applied to a vertical surface, resulting in paint sagging.
Let us now look at what causes sagging, and its possible solution:
1. Low paint viscosity
2. Excessive product load
3. Incorrect painting technique
4. Flash-off time between layers.
5. Use of slow thinners.
By following these steps, the appearance of paint or clearcoat sagging will be prevented.
How to Fix CLOUDING Painting Defect – SINNEK
With this video you will learn how to solve CLOUDING defect in car paint and the causes for which it appears.
The appearance of clouding or streaks in car paint results from misapplication during repainting.
This usually occurs in colours such as shades of grey, gold or champagne . Clouding, also known as paint cloudiness, is a repainting defect that requires repeating the work process from the intermediate coats to be repaired. Therefore, as professional painters, it is important that you know the reasons why clouding appears in paint and how to repair this.
This will impact on increasing the production level and profitability in the bodywork and paint shop.
What are they and how are clouding or cloudiness formed in car paint?
Paint clouding is a repainting defect that appears as a stain or streak with different shapes and shades in the finish paint. This causes irregularities in the colour’s intensity, resulting in some lighter and some darker areas in the repaired parts.
One of the main causes of the appearance of clouding in paint is an incorrect application of the finish paint, especially in metallic colours. An irregular arrangement and orientation of the metallic particles containing these colours will cause an irregular light reflection on the surface, resulting in the appearance of different saturations and intensities in the final colour.
How to Prevent SOLVENT BOILS OR BUBBLES in Paint – SINNEK
What are car paint solvent boils also known as solvent popping?
Solvent boils appear when the solvent in a coat is occluded under the outer surface of the topcoat that has dried. That is to say, these are solvent particles that have not finished evaporating, and that have been trapped by another top layer that has evaporated faster and has dried.
To prevent solvent boils in automotive paint, you must pay special attention to the drying process, always considering the room temperature and following the drying times instructed for the product by the manufacturer.
How to Prevent GLOSS LOSS in Automotive Paint – SINNEK
With this video you will learn how to solve Gloss Loss defect in car paint and the causes for which it appears.
The loss or reduction of gloss of a surface is a relatively common paint defect that can occur during the clear coating process in repairs.
What are gloss losses in automotive paint?
Gloss reduction or loss in automotive paintwork occurs when a painted surface has a more matte and less glossy finish than required, with a different gloss intensity of the repaired surface compared to the rest of the parts.
This is a defect that is easy to observe with the naked eye, even from a position far away from the surface, and that does not usually have surface irregularities as it can happen with other paint defects such as sinkage or silicones.
How to Fix ORANGE PEEL Defect in Car Paint – SINNEK
With this video you will learn how to solve the orange peel defect in car paint and the causes for which it appears.
One of the most common defects in car refinish is the appearance of the so-called orange peel effect.
What is the orange peel effect in paint? The name orange peel is given by the resemblance of the final paint finish to an orange peel. This problem is caused by the lack of stretching or levelling of the paint, resulting in a deformed surface and in an increased thickness of the final coat.
How to Prevent CRATERING IN AUTOMOTIVE PAINT – SINNEK
With this video you will learn how to solve the cratering defect in car paint and the causes for which it appears.
What is cratering in car paint? Cratering is one of the most common defect in the repainting process. Almost certainly, most professional painters have had to deal with this painting defect at some point.
Craters are defects in car refinishing that appear in intermediate layers and above all in the finish, giving rise to circular cavities that are very similar to the shape of a crater.
In some cases, impurities can also be observed in the center of the crater.
Causes for the appearance of cratering:
1. Inappropriate cleaning of the surface
2. Environmental pollution, mainly by silicones
3. Presence of water or oil in the compressed air
4. Dirt on application equipment
5. Lack of maintenance of the spray booth
SINKAGE PAINTING DEFECT: CAUSES AND SOLUTION – SINNEK
Sinkage, also known as paint loss or sinkage, is a usual repairing defect at the bodyshop. This application error occurs when the final coat of paint has dried and has a kind of surface sinkage in the repaired area. Sinkage is often related to an incorrect preparation of the intermediate coat, especially during the putty application phase, hence they are also called putty sinkage or patch marks.
Wax Incorporation
Smears, Wax Impregnation, Wax Incorporation, Wax Retention, Wax Under Film, Wet Spots
DESCRIPTION
Smears or dull areas in the paint film. The affected areas may feel greasy.
CAUSE
Absorption of wax into the paint film due to:
a) Application of wax polish before the paint has fully hardened.
b) Excessive or incorrect use of polish or compound.
c) Poor polishing technique.
d) Storage of wax protected vehicles under hot conditions.
PREVENTION
a) Allow the surface to harden fully before polishing.
b) Use only recommended products, use as instructed.
c) Use correct polishing techniques, ensure that the gloss level is even over the entire surface.
d) Protect stored vehicles from excessive heat.
RECTIFICATION
Apply a solvent cleaner, followed by polishing with a non-wax polish. Repeat until all wax has been bled from the surface, then repolish.