Hairline cracks should be cleaned, opened slightly, patched, sanded, primed, and painted so they do not return too quickly.
Do Not Paint Directly Over Hairline Cracks
Hairline cracks may look small, but if paint is applied directly over them, the lines can appear again. In Bali, heat, rain, and humidity changes can make small cracks more visible after finishing.
1. Clean the Cracked Area
Remove dust, weak old paint, and dirt around the crack. A clean surface helps repair materials bond better.
2. Open the Crack Slightly
Very narrow cracks can be difficult to fill. Open the crack slightly along its path so the repair material can enter and lock better.
3. Use the Right Repair Material
Choose putty, filler, or repair compound according to wall condition. Active cracks need more serious handling because the cause may come from structural movement.
4. Sand and Prime
After the patch dries, sand it until flat. Apply primer to balance surface absorption before the finish coat is applied.
Conclusion
Repairing hairline cracks properly creates a cleaner and longer-lasting paint finish. Do not rush painting before the cause and surface condition are ready.
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