Door lock and door painting process is really interactive, mainly due to installation timing, surface treatment, environmental factors and so on. Improper handling can cause paint to peel off the door's surface, scratch the door paint on the door, or reduce adhesion between the two.
I. Interaction between Door Locks and Painting Processes
Improper Installation Timing
Installation before paint is completely dry: If door lock are installed before the door paint is fully cured, which usually requires 24-72 hours, solvents in the paint can evaporate onto the surface of the door lock, causing the paint film to soften and fall off.
3. Paint after door lock preinstall: If the door lock is installed before painting, paint may cover the edge of the door lock, causing the paint to fall off due to friction or temperature changes during subsequent use.
Differences in surface treatment
2. Mismatch between door lock materials and paint: Plated door locks, for example, may come off in a chemical reaction with watery paint, metal door locks may be painted directly without rust prevention treatment, and rust can crack paint film.
1. Surface roughness: If the surface is not polished before painting, it is easy to create a concentration of stress around the screw holes during lock installation, causing the paint to crack.
Environmental Factors
Humidity and temperature: High humidity slows the solidification of paint, increasing the interaction time between lock and paint, and low temperatures can make paint brittle and reduce impact resistance.
Chemical Corrosion: Exposure to corrosive substances such as detergents and sweat can accelerate paint ageing.
II. How to prevent lockdown paint from peeling
1.Optimize Installation Process
Step by step:
First, finish the door painting (both primer and finish) and make sure it's completely dry (it usually requires more than 72 hours).
Use professional tools to drill precise holes and avoid repeated adjustments to avoid damaging the facade.
Finally install the lock to minimize contact time between paint and lock.
Temporary protection: before installation, cover key parts of the lock (such as the cylinder and handle) with tape or plastic film to prevent paint splattering.
If you require to pre-install the lock position, use movable tape to secure it and avoid direct contact with paint.
2. Enhanced surface treatment
Door Lock Pre-treatment:
Metal Door Locks: Sand-blasted or abraded to remove oxide layer, coated with a rust-resistant primer (e.g. epoxy zinc-rich primer), then spray with a topcoat (e.g. polyester paint or fluorocarbon paint).
Plastic Door Locks: Clean surface oil stains with alcohol and spray with a special plastic paint (compatible with the door's paint).
Plated Door Locks: Avoid acid cleaners and regularly use neutral wax for maintenance.
Door treatment: The surface of the door is thoroughly polished before painting to ensure smoothness ≤0.5mm.
Use paint that is compatible with the material of the door lock (such as metal paint for metal locks, wood paint for wooden doors).
paint film thickness (usually 20-30 microns) is controlled when spraying, and the thickness is too high, leading to cracking.
3. Control Environmental Conditions
Construction environment: Temperature controlled between 15-30°C, humidity ≤60%. Avoid working in wet and rainy conditions.
Use a a dehumidifier or heating equipment to speed up paint curing (follow paint instructions). Usage and maintenance: After installation, avoid using acid or alkaline cleaner to wipe the door lock, just use neutral soapy water to clean.
Check the lock screws regularly to prevent paint from falling off due to vibration.
4. Choose quality materials
Door Lock material: mainly stainless steel, aluminum alloy or engineering plastic door locks, because their corrosion resistance than ordinary carbon steel.
Verify door lock surface treatment process (e.g., electroplating spraying, anodizing) and select a solution that matches the door paint.
Type of paint:
Outdoor door door: choose weather-resistant fluorocarbon or polyurethane paint, with anti-ultraviolet, anti-fading features.
Indoor doors: Use water-based paints or eco-friendly wood paint to reduce the impact of volatile organic compounds on door lock.
III. Treatment of Frequently Asked Questions
Repair Peeling Paint:
Peel: Tinker with a paint pen of the same colour and dry until the sand is smooth.
Severe Peeling: Remove old paint layer completely, reapply primer and finish to ensure adhesion.
Paint blisters:
Reasons: Paint is not completely dry, the door has too much water, or the door lock react with the paint.
Solution: Remove blistering areas, leave the door completely dry, then reapply the paint. Avoid incompatible materials.
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