Melamine top coat is one of the most widely used finishing systems in the furniture industry, especially for indoor wooden and rattan products. It is popular because of its durability, cost efficiency, and attractive final appearance. However, like all coating systems, melamine has both strengths and limitations — particularly in long-term color stability.
This article explains the characteristics of melamine top coat, why discoloration may occur over time, and how to prevent it.
1. Luxurious Visual Appearance
One of the main reasons melamine is widely used is its ability to enhance the natural beauty of wood and rattan.
High Transparency
Melamine has excellent clarity, allowing the natural grain and texture of wood or rattan to stand out clearly. This makes it ideal for natural and light-colored finishes.
Sheen Options
It is available in multiple gloss levels:
- Clear Gloss (very shiny)
- Semi Gloss
- Matte/Doff (non-shiny)
This flexibility allows manufacturers to adjust the final look according to design preferences.
Smooth Surface
When applied using a spray technique, melamine creates a thick and even film layer. The surface becomes smooth to the touch and visually refined.
2. Physical and Chemical Resistance
Melamine is known for forming a strong protective layer.
Hard Film Protection
It creates a very hard surface coating that provides good resistance against scratches and daily wear.
Heat and Household Chemical Resistance
Melamine can withstand minor heat exposure and common household spills such as coffee, tea, and alcohol. It is also relatively resistant to standard cleaning agents, making it a popular choice for indoor furniture.
Non-Breathable Seal Melamine completely seals the pores of wood or rattan, helping protect the material from sudden changes in humidity.
3. Application and Technical Information
Two-Component (2K) System
Melamine must be mixed with a hardener before application. This chemical reaction allows it to cure properly and form a durable film.
Fast Drying
Surface drying typically occurs within 15–20 minutes. However, full curing and maximum hardness may take several days.
For Interior Use Only
Melamine is not UV resistant. Continuous exposure to sunlight may cause yellowing, cracking, or peeling over time.
4. Disadvantages to Consider
Despite its advantages, melamine also has limitations.
Strong Odor During Application
It contains relatively high formaldehyde content. During spraying, the odor is strong and requires proper ventilation.
Brittle Nature
Because the film is very hard, it can also be rigid. If the rattan expands, contracts, or receives heavy impact, small hairline cracks may appear.
Why Does the Color Change After a Few Months?
If you applied melamine to a rattan chair and noticed color changes after several months, this is generally caused by chemical reactions and environmental exposure. Melamine has a known weakness in long-term color stability.
Below are the main causes:
1. Natural Yellowing Effect
Melamine contains amino resin and formaldehyde. Over time, oxidation occurs naturally. This chemical process causes the clear coating layer to turn yellow.
This effect is especially noticeable on: Natural finishes
- Natural finishes
- Light colors
- Whitewashed tones
2. Sunlight Exposure (UV Rays)
Melamine is specifically designed for interior use.
If rattan furniture is placed:
- Near windows with direct sunlight
- In semi-outdoor areas like terraces
- In bright rooms with strong UV exposure
UV rays will accelerate the breakdown of the melamine film. As a result:
- The surface may turn yellow
- The finish may look dull
- Gloss levels may decrease
3. Natural Characteristics of Rattan
Rattan is an organic material that continues to “breathe.”
Natural Oil or Sap Migration
If cleaning or sanding is not done thoroughly before finishing, natural oil from inside the rattan may seep out and react with the coating, causing discoloration from beneath the surface.
Moisture Content
If rattan is not fully dry before coating, trapped moisture may cause:
- Cloudy or milky appearance
- Dull surface over time
4. Reaction with Cleaning Agents
Frequent cleaning with strong household chemicals can damage the top coat surface. This may cause:
- Loss of gloss
- Surface discoloration
- Premature aging of the coating
How to Prevent Further Discoloration
While some degree of color change is natural over time, the following steps can help minimize the risk:
Avoid Direct Sunlight
Place furniture in areas protected from UV exposure.
Use Gentle Cleaning Methods
Clean only with a slightly damp microfiber cloth. Avoid harsh liquid chemicals.
Consider Alternative Coating Systems for Future Projects
If color stability is a top priority, consider using:
- PU (Polyurethane) – Offers better durability and flexibility, with improved resistance to yellowing.
- Acrylic Coating – Provides good UV resistance and better long-term color clarity.
- NC (Nitrocellulose) – Suitable for decorative indoor furniture, though less durable.
Compared to melamine, PU and Acrylic generally offer better anti-yellowing performance.
Final Thoughts
Melamine top coat remains a popular choice because it provides:
- Attractive appearance
- Strong surface protection
- Cost efficiency
- Good performance for indoor furniture
However, it is important to understand that melamine is not fully color-stable in the long term, especially when exposed to sunlight or environmental stress.
Rattan is a natural material, and natural variations combined with chemical aging are part of the product’s life cycle. Proper placement, maintenance, and coating selection will help ensure the best long-term results.
If long-term color consistency is your primary concern, upgrading to PU or Acrylic coating systems is strongly recommended.
Watch the full explanation in our video below:
