ICI Dulux Exterior Crackbridging Primer — Flexible Primer for Older Walls in Karachi
ICI Dulux Exterior Crackbridging Primer is a specialist exterior primer formulated to bridge hairline cracks before painting. Available at Saify Paint House, your authorized ICI Dulux Paints dealer in Karachi since 1999, it is essential preparation for older buildings and any exterior wall with existing hairline cracking.
Working beneath the topcoat, it adds a flexible layer of movement accommodation to the exterior system — the primer-level counterpart to ICI Dulux Weathershield Powerflexx above it.
Why Crack-Bridging Belongs in the Primer, Not Just the Topcoat
Exterior walls in Karachi move continuously. Buildings settle, plaster shrinks as it cures, and daily temperature swings expand and contract masonry year-round. On older buildings, that movement has usually already produced a network of hairline cracks by the time repainting is considered.
A single crack-bridging topcoat can span some of that movement, but it works considerably better with a matched primer beneath it. The primer penetrates into the cracked surface first, binding loose material and creating a flexible base layer. The topcoat then bridges on top of a surface that is already stabilised, rather than trying to accommodate movement and adhere to a compromised substrate at the same time.
This two-layer approach is what separates a genuinely durable crack repair from one that looks fine for a season and reopens the following year. On a building with active settlement or a history of recurring cracks in the same locations, skipping the primer stage and relying on the topcoat alone is a common reason crack-bridging systems underperform.
The primer also serves the ordinary functions of any exterior primer — sealing porosity, improving adhesion, and providing a consistent base for uniform topcoat colour. It simply does all of that while also flexing with the substrate.
ICI Dulux is backed by AkzoNobel, a global leader in paints and coatings with over 200 years of innovation. Full technical specifications for this product are available on the official Dulux Pakistan website.
Key Features
- Crack-bridging technology — Flexes with the substrate to span hairline cracks
- Specialist exterior formulation — Built for older and previously cracked walls
- Binds friable surfaces — Stabilises chalky and weathered plaster
- Improves adhesion — Gives crack-bridging topcoats a stable base
- Controls absorption — Evens out porosity for uniform topcoat coverage
- Weather resistant — Withstands exterior exposure during the coating system’s life
- Complements Powerflexx — Two-layer flexibility for demanding facades
- Essential for repair work — The right specification for repeat cracking
Recommended Applications
ICI Dulux Exterior Crackbridging Primer is used ahead of crack-bridging topcoats:
- Older buildings with visible hairline cracking
- Facades with a history of recurring cracks
- Newly settled buildings still experiencing structural movement
- Walls repaired with exterior acrylic putty
- Main facades where maximum durability is required
- Any exterior surface receiving Weathershield Powerflexx
Suitable for properly prepared exterior plaster, concrete, cement render, and masonry surfaces.
Surface Preparation & Application
Crack-bridging primer spans hairline movement — it does not repair structural cracks. Anything wider than a hairline needs investigation and proper repair before any coating system goes on.
The surface must be clean, dry, fully cured, and free from dust, loose material, chalking, oil, and grease. Test chalky surfaces by rubbing with a dry hand; if it powders, keep brushing down before proceeding.
Fill visible cracks and larger defects with ICI Dulux Exterior Acrylic Putty before priming. The primer bridges hairline cracks; it does not replace filling where cracks are already substantial.
Treat fungal and algal growth before priming. Painting over it traps the growth and it returns through the coating system within a season.
Stir thoroughly before use. Apply by brush, roller, or spray, thinning as directed on the pack, and follow the coat count and drying interval specified on the label. Achieving the correct film thickness is what delivers the crack-bridging property — under-application compromises the system. Avoid application in direct midday sun or when rain is expected during drying. Clean equipment immediately after use.
Completing the Crack-Bridging System
This primer is designed to work as a system with the matched topcoat.
Follow with ICI Dulux Weathershield Powerflexx for maximum crack-bridging protection on facades with active or historical movement.
Where cracking is minor, ICI Dulux Weathershield alone may suffice — our team at either DHA store can assess your walls and recommend the right combination.
Buy ICI Dulux Exterior Crackbridging Primer in Karachi
ICI Dulux Exterior Crackbridging Primer is available at both Saify Paint House locations in DHA Karachi — Shop #2, Plot 31-E, 7th Street, Badar Commercial, DHA Phase 5, and Shop #2, Al Raheem Center, Main Gizri, opposite Mubarak Masjid. As an authorized ICI Dulux Paints dealer in Karachi, we stock the complete Dulux range with immediate availability.
Our team can assess your wall condition, recommend the right crack-bridging system, and estimate quantities for your facade. For pricing across all pack sizes, bulk rates for contractors and developers, or expert advice, message us on WhatsApp or call 0333-5843610.
