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8 Common Problems in Plastering & Coating Projects and How to Prevent Them

 In construction projects, wall coatings and plastering systems affect not only appearance, but also durability, waterproofing performance, and long-term maintenance costs.

Many projects experience problems such as:

Exterior wall cracking and peeling

Efflorescence and chalking

Damp stains in bathrooms

Uneven corners and edges

Cracks between walls and ceilings

Although these seem like surface defects, most are actually caused by substrate treatment, material selection, and improper construction practices.

1. Exterior Wall Paint Cracking & Peeling

Main Causes

Plaster applied too thick without layered application

Dust remaining on substrate before coating

No mesh reinforcement at different substrate joints

Poor quality exterior putty

Painting before walls are fully dry

Prevention Solutions

Apply plaster in layers with proper curing

Remove all sanding dust before painting

Use mesh reinforcement at wall junctions

Select weather-resistant exterior putty

Avoid construction under rain or strong sunlight



2. Damp & Peeling Walls in Bathrooms and Balconies

Main Causes

Insufficient waterproofing height

Waterproof layer damaged during later works

Poor tile joint sealing

Improper slope causing water accumulation

Prevention Solutions

Waterproofing height in shower areas should exceed 2000mm

Conduct 24-hour water retention test after waterproofing

Use sealant at wall-floor joints

Ensure proper drainage slope

3. Efflorescence, Chalking & Peeling on Exterior Walls

Main Causes

High alkalinity of substrate

Poor water resistance of paint

Low quality putty

Construction during rain or low temperature

Excessive water added during mixing

Prevention Solutions

Apply coating only after proper curing age

Use alkali-resistant primer

Select water-resistant coating systems

Control water addition strictly

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4. Cracks Between Wall and Ceiling

Main Causes

Different shrinkage rates of materials

No anti-crack mesh reinforcement

Poor treatment at pipe groove repairs

No corner protection between ceiling and wall

Prevention Solutions

Install mesh at material transition areas

Use polymer anti-crack mortar for groove repair

Install PVC corner beads at ceiling joints

5. Uneven Plaster Surface & Poor Corner Alignment

Main Causes

No leveling guides before plastering

Plaster applied too thick at one time

Different water absorption of substrates

Premature finishing before setting

Prevention Solutions

Use laser or leveling guides

Apply plaster in layers

Pre-wet wall surfaces

Use corner tools for alignment

Construction Quality Depends on More Than Materials

Most wall failures are not caused by paint quality alone.



The real key factors include:

Substrate strength

Moisture control

Plastering process

Material compatibility

Site management

Only when substrate, mortar, putty, and coating systems work together properly can long-term wall durability be achieved.

ARICH focuses on construction additives for drymix mortar systems, including:

HPMC / MHEC

Redispersible Polymer Powder (RDP)

Tile Adhesive Solutions

Skim Coat & Putty Systems

Gypsum & Plaster Solutions



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