How To Fix Paint Lines On A Car

Cratering is ane of the most mutual defect in the repainting process. Almost certainly, near professional painters have had to deal with this painting defect at some indicate.

With this tutorial yous will larn why they are formed and how to solve this problem.

What is cratering in auto paint?

Craters are defects in machine refinishing thatappear in intermediate layers and in a higher place all in the finish, giving rise to circular cavities that are very similar to the shape of a crater. In some cases, impurities tin also exist observed in the center of the crater.

Superficie pintada con siliconas y crateres

The appearance may be different depending on where the craters are located, with flatter cavities in the acme layer of the paint, upwardly tosevere moisture problems that penetrate to the substrate.

The main cause of their appearanceis due to the lack of moisture of the substrate or base layer, leaving these visible, to a greater or lesser extent, depending on the surface tension.

They are usually produced due to thepresence of contaminants in the pigment such equally silicones, greases, waxes or oils that repel paint. These contaminants can be institute in the cloth used to clean the part (cloths), or in tools used during the painting process, such as a spray gun or the compressed air line.

The size of this defect can vary, ranging in size between 0.v and 5 mm, which influences the subsequent repair process.

This is of import because if the cracks have not been completely repaired and removed, cratering can become visible again in the form of flat cavities.

Causes for the appearance of cratering

The chief causes of the advent of cratering take to do with the presence of contaminants in different supports, from people and tools, to paint booths and materials.

Inappropriate cleaning of the surface

The use of dirty cloths, containing residues of resins or other substances, added to a non-uniform cleaning movement of the support, will contribute to the formation of cratering.

Environmental pollution, mainly past silicones

The presence of silicone can occur both in the environment and on the back up. This trouble can occur even in cases where the exposure of the part to silicones has been for a short period of fourth dimension.

Presence of water or oil in the compressed air

You should ever ensure a correct cleaning and maintenance of the compressed air line, preventing it from containing traces of h2o, grease or oil.

Clay on application equipment

The presence of contaminants such equally grease, soap, detergent or oil in piece of work tools such every bit spray guns or hoses should be avoided, always ensuring that they are in an optimum clean state for work.

Lack of maintenance of the spray booth

Berth smoke saturation caused by combustion bedroom leaks, and dirt on roof filters and floors, and sealing agents are possible causes of this defect.

Measures to prevent the advent of cratering

Correct cleaning of the part or support

Meticulously clean the part yous are going to work on with a suitable degreaser. Practice not let the cleaning solvents dry on the surface: remove them with a clean, dry fabric and change this cloth with each cleaning. Information technology is advisable to completely remove whatever silicone shine from the surface to be painted and avoid using this type of polish nigh the paint section.

Spray booth and compressed air line maintenance

Command the status and functioning of the booth and air-line, renewing the filters, cleaning the ducts and carrying out periodic purges of compressed air in the facility.

Cleaning of painting tools

All items involved in the awarding process must exist correctly decontaminated from whatsoever blazon of substance. Something as simple as an impurity in a mixing rod can give rise to this trouble. In addition, always use a suitable solvent for cleaning the spray gun and dry out it thoroughly, specially when using h2o-based products.

Steps to solve cratering in the bodyshop

To solve the appearance of cratering in the pigment, you lot must first permit the finish to dry completely, in lodge to correctly assess the severity of the problem.

If the craters are not very large, a good solution would be to sand the surface of the part with P1500 sandpaper, and afterwards polish and glaze the surface.
If the defect is deep, you should sand down to a surface that is free of defects. Then make clean it meticulously with anti-silicone solvent and start the painting process from the base of operations.

In specific cases, and if the defect is very noticeable, we can utilise a special anti-silicone additive, always following the indications provided on the technical data sheet.

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