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he Most Ignored Step in Renovation: Painting Material Selection Guide

 1. Wall Problems Are Actually Predetermined

Many homeowners notice issues after living in the house for 1–2 years:

Cracks

Powdering

Mold growth

Uneven paint surface

But the real reason is simple:

👉 The problem was already created during the painting material selection stage.

2. Wrong Putty = Hidden Structural Risk



1. The Key Difference: Type N vs Type Y

Type Y: general putty, weak against moisture

Type N: water-resistant, stronger bonding and stability

👉 For residential projects: always choose Type N

2. Why Do Walls Crack or Hollow?

Common causes:

Use of Type Y putty

Moisture reduces strength

Base layer becomes unstable

👉 Topcoat cannot fix a weak base

3. Environmental Safety Is Mandatory

A proper putty must be:

Glue-free system

Water-mixed only

Low VOC & compliant with standards



3. Wall Paint Is About Data, Not Marketing

1. Key Indicator: VOC

Ignore marketing terms like “odorless” or “baby-safe”. Focus on:

VOC level (lower is better)

Environmental certification

Test reports

2. Key Indicator: Washability

Minimum requirement:

👉 ≥3000 scrub cycles

Otherwise:

Easy to damage

Color fading after cleaning

3. Key Indicator: Anti-Mold Performance

Essential for:

Humid climates

Kitchens

Bathroom dry zones



4. Primer Is the Real Foundation Layer

Primer functions:

Seals substrate

Prevents alkali return

Improves adhesion

👉 Correct system: 1 primer + 2 topcoats

5. Three Critical Construction Rules

1. No Glue Allowed

All materials must be water-mixed only.

❌ Adding glue destroys performance and safety.

2. Proper Thickness Control

👉 Total putty thickness ≤3mm

Too thick leads to:

Shrinkage cracks

Hollow areas

3. Controlled Drying Process

Wrong method:

❌ Direct sunlight or strong airflow

Correct method:

✔ Slow and stable drying environment

6. Conclusion: Wall Quality Is a System Result

Wall durability depends on:

Putty (structure)

Paint (surface)

Primer (bonding system)



👉 If one layer fails, the whole system fails.

📌Final Insight

Wall quality is never luck — it is determined at the material selection stage.

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