What are the types of defects in paints?

Paint & Coating Defects: What Are The Common Types?

  • Abrasion. Removal of a part or whole of the paint or coating film caused by impact by an object harder than itself.
  • Adhesion Failure.
  • Blistering.
  • Bloom / Blush.
  • Chalking.
  • Cissing.
  • Cracking.
  • Cratering.

What causes paint hazing?

With respect to paints and coatings, haze is caused by microstructures or suspended particles which slightly change the direction of a reflected light. The change in direction causes a bloom adjacent to gloss (specular) angle, thus, showing a milky effect.

What are the different types of automotive paint?

There are 3 basic types of car paint; Lacquer, Enamel and Urethane.

How do you identify paint defects?

Lifting – Wrinkling, Raising, Alligatoring, Shrivelling, Swelling. Identification: The existing paint film shrivels, wrinkles or swells during new finish application or drying. Wrinkling, often called lifting, is when an existing paint layer shrivels during the application of a new finish or as the new finish dries.

What are the coating defects?

17 possible coating defects that may occur:

  • Blistering. Description: Small to large broken or unbroken bubbles; the surface may feel like sandpaper.
  • Blushing. Description: Flat finish with a milky appearance.
  • Checking.
  • Cracking.
  • Cratering.
  • Delamination.
  • Fish Eyes.
  • Mud Cracking.

What is paint mottling?

What is mottling or streaking? This is when the metallic particles in a refinishing material “float” together and can form a streaking pattern or “tiger stripes”. One of the common causes of mottling is a spray gun being held too close to the surface causing the refinishing material to be applied too wet.

What are the 4 main layers of automotive paint?

A typical automotive coating system consists of four layers as shown in Fig. 1, namely the e-coat, the primer or filler, the basecoat and the clearcoat, and the latter two-layers are combined into the topcoat.

What is 2K automotive paint?

2K (or 2 Pack) describes coatings that require a hardener, catalyst or activator, which is commonly used in car body shops. Once it hardens, it provides a much stronger substrate less susceptible to damage from chemicals, weather, abrasion or UV rays.

What causes wrinkles in auto paint?

This problem occurs when a paint layer shrivels up while you are applying a new finish or while the new finish is drying. This happens when solvents in your new finish attack the old finish, causing the lifting and wrinkling.

What is peeling paint defect?

Peeling. Peeling off paint occurs on walls as well as on wooden or metal surface. It is the swelling of paint film/layer that is due to loss of adhesion between one or more coatings or between primer and parent surface & moisture on the surface. It is one of the most common paint defect observed on the painted surface.