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Solutions for Missing Area or Poor Hiding in Waterborne Wood Coating Application HILHELM Waterborne Paint

2026-05-12

Solutions for Missing Area or Poor Hiding in Waterborne Wood Coating Application

HILHELM Waterborne Paint

"Missing area" (commonly known as lack of paint) refers to the phenomenon where parts of the coated surface are left unpainted. "Poor hiding" means that after the waterborne wood coating has been applied and dried, the solid topcoat fails to cover the primer.

Why do these issues occur? Are they due to the waterborne coating itself or the application process? HILHELM Waterborne Paint believes that missing area or poor hiding in waterborne wood coating applications are generally caused by the following reasons, and provides solutions for reference.

Cause Analysis 1

Incorrect proportioning of the coating, such as too low pigment content or poor pigment hiding power.

Solution:

Increase the pigment amount in the waterborne wood coating to enhance hiding power.

Cause Analysis 2

Insufficient stirring before use, causing settled pigment not to be fully mixed or uneven distribution.

Solution:

Ensure the waterborne wood coating is stirred thoroughly before application. Simple shaking is not enough. Generally, use an electric stirrer for at least 3 minutes, or stir with a wooden stick for 5–10 minutes, or pour back and forth between two containers 2–3 times. If application stops for more than 2 hours, stir again. A well-mixed coating should have no sedimentation, no color difference, no resin floating on top, and should flow in a continuous stream when poured.

Cause Analysis 3

Improper surface preparation of the substrate, mainly applicable to clear coating on wood.

Solution:

Before applying waterborne wood coating, remove oil stains, dust, etc. from the wood surface. This ensures good adhesion and a smooth, flat paint film.

Cause Analysis 4

Excessive dilution of the waterborne wood coating, resulting in low application viscosity.

Solution:

Add 0–10% water as needed for application, but do not add too much water.

Cause Analysis 5

Applying the coating too thin; only one coat of topcoat when using different colors of primer and topcoat, with missed areas; or uneven film thickness due to uneven substrate surfaces.

Solution:

Follow the correct sequence for waterborne wood coating application and ensure uniform film thickness. Choose the proper application process according to the wood product characteristics to avoid missing areas or uneven coverage.

Cause Analysis 6

Excessive contrast between primer and topcoat colors, e.g., applying a light-colored topcoat over a dark-colored primer.

Solution:

The color difference between primer and topcoat should not be too great.

Cause Analysis 7

Over-sanding, penetrating through the paint film.

Solution:

Apply wood filler first, then sand gently, slowly, and with even pressure. Sand only until the surface is smooth, and avoid sanding through the film.

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Solutions for Missing Area or Poor Hiding in Waterborne Wood Coating Application HILHELM Waterborne Paint

2026-05-12

Solutions for Missing Area or Poor Hiding in Waterborne Wood Coating Application

HILHELM Waterborne Paint

Cause Analysis 1

Incorrect proportioning of the coating, such as too low pigment content or poor pigment hiding power.

Solution:

Increase the pigment amount in the waterborne wood coating to enhance hiding power.

Cause Analysis 2

Insufficient stirring before use, causing settled pigment not to be fully mixed or uneven distribution.

Solution:

Cause Analysis 3

Improper surface preparation of the substrate, mainly applicable to clear coating on wood.

Solution:

Before applying waterborne wood coating, remove oil stains, dust, etc. from the wood surface. This ensures good adhesion and a smooth, flat paint film.

Cause Analysis 4

Excessive dilution of the waterborne wood coating, resulting in low application viscosity.

Solution:

Add 0–10% water as needed for application, but do not add too much water.

Cause Analysis 5

Applying the coating too thin; only one coat of topcoat when using different colors of primer and topcoat, with missed areas; or uneven film thickness due to uneven substrate surfaces.

Solution:

Cause Analysis 6

Excessive contrast between primer and topcoat colors, e.g., applying a light-colored topcoat over a dark-colored primer.

Solution:

The color difference between primer and topcoat should not be too great.

Cause Analysis 7

Over-sanding, penetrating through the paint film.

Solution:

Apply wood filler first, then sand gently, slowly, and with even pressure. Sand only until the surface is smooth, and avoid sanding through the film.