What Are the Problems With Coatings? Common Issues & Solutions

What Are the Problems With Coatings?

08 Aug, 2025

In sectors like industrial, automotive, aerospace, and construction, coatings are crucial for surface protection, aesthetic improvement, and increased durability. Coatings can, however, encounter a number of difficulties in spite of their advantages, some of which are never mentioned.

To assist companies and customers in making wise decisions, we will examine the main issues with coatings, their root causes, and possible fixes in this blog.

Common Problems with Coatings

1. Poor Adhesion (Peeling & Flaking)

Issue: Coatings may fail to stick properly, leading to peeling, flaking, or bubbling.

Causes:

Improper surface preparation (dirt, grease, moisture)
Wrong primer or coating type for the substrate
Environmental factors (humidity, temperature)

Solution:

Clean and sand surfaces before application.
Use compatible primers and adhesion promoters.
Follow manufacturer’s curing guidelines.

2. Cracking & Brittleness

Issue: Coatings can develop cracks over time, reducing protection.

Causes:

Over-application (thick layers)
Aging and UV exposure (especially in outdoor coatings)
Thermal expansion/contraction

Solution:

Apply thin, even coats.
Use flexible, UV-resistant coatings for outdoor use.
Consider elastomeric coatings for surfaces prone to movement.

3. Bubbling and Blistering

Issue: Unattractive blisters are caused by air or moisture that gets trapped beneath the coating.

Causes:

Infiltration of moisture (frequent in metal and wood coatings)
Drying quickly in hot weather
Entrapment of solvents

Solution:

Before applying a coating, make sure the surfaces are totally dry.
Steer clear of painting in direct sunshine or intense heat.
For surfaces that are prone to dampness, apply breathable coatings.

4. Fading and Discoloration

Issue: Oxidation, solvents, and UV radiation cause coatings to lose colour.

Causes:

Poor pigment quality
Absence of UV stabilizers
Exposure to chemicals (alkalis, acids)

Solution:

Select superior, UV-resistant coatings.
For added longevity, use transparent protective topcoats.
When working in hostile settings, use industrial-grade coatings.

5. Corrosion Under Coating (CUC)

Issue: Hidden rust forms beneath the coating, leading to structural damage.

Causes:

Poor surface preparation (rust not fully removed)
Moisture seepage through micro-cracks
Incompatible coatings for metal substrates

Solution:

Use abrasive blasting or phosphating for metal prep.
Apply corrosion-inhibiting primers (e.g., zinc-rich coatings).
Conduct regular inspections for early detection.

6. Poor Chemical Resistance

Issue: Coatings degrade when exposed to harsh chemicals (oils, solvents, acids).

Causes:

Wrong coating selection (e.g., latex paint in industrial settings)
Thin or improperly cured coatings

Solution:

Use epoxy, polyurethane, or fluoropolymer coatings for chemical resistance.
Ensure proper curing time before exposure.

How to Prevent Coating Failures

Surface Preparation is Key – Clean, dry, and roughen surfaces for better adhesion.
Choose the Right Coating – Match the coating to the substrate and environment.
Follow Application Guidelines – Proper thickness, drying time, and curing conditions matter.
Regular Maintenance – Inspect and touch up coatings before major damage occurs.

Final Thoughts

While coatings provide essential protection, improper selection, application, or maintenance can lead to costly failures. By understanding these common problems—and how to avoid them—businesses and consumers can extend coating lifespan and performance.