Dirt Inclusions

Also known as:
Dirt, bits, dirt in paint, inclusions, seed, grains, specks, spikes, grits, nibs
 

Description:
A surface with this defect will show particles of different sizes deposited in the primer or color.

Origin and Potential Causes:

Various types of contamination typically introduced during the application or drying process.Static charge on surface of vehicle. This condition helps the attraction of dust.Dust and dirt from dry sanding, cloths, etc.Use of poor quality masking paper.Tack rag was not used before spraying, or not immediately before.Inadequate filtration of air.Dry spray dust settling on wet paint.Paint kept in dirty containers/tins.Paint was not strained.Operators clothing bearing dirt, fibres and dust.Paint has been kept longer than recommended.Inadequate filtration of compressed air.Activator or thinner used were incorrect.The car was not thoroughly blown out.Tintings/pigments were not sufficiently stirred.Spray dust accumulated on spray booth surfaces/walls.Use, re-thinned, of 2K materials after the recommended potlife.

 Prevention Techniques:

Use anti- static fluid or attach the vehicle to electrical earth. Keep body shop as clean as possible. Always keep spray booth doors closed. Wet floor and wall if necessary. Wear special spray suits. Blow out all mouldings, seams etc. Blow the vehicle out before placing it in the spray booth. Use the tack rag immediately before applying each coat. Care of the maintenance of the equipment Follow the recommendations (pressure, thinner) to avoid overspray.Clean the vehicle before starting the repair.Mix the color thoroughly after sufficient stirring of tintings. Do not exceed the recommended pot life of 2K materials. Use a fine strainer.

 Remedies:

Allow the finish to harden completely, fine sand and polish. If the defect is severe, sand and re spray.

Click on the below images for a magnified view of additional examples:

Contaminated Basecoat                    Fiber in Surface                              Metal Particle in E-Coat

Detailed Image Contaminated

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Detailed Image-Fiber

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Detailed Image Metal

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Detailed Image Dirt Inclusion

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