Dr. Fixit Crack-X Powder – Cementitious Crack Filler

Dr. Fixit Crack-X Powder: Non-Shrink Cementitious Filler for Wide Cracks

For structural cracks and deeper voids that polymer pastes cannot handle, you need the strength of cement. Dr. Fixit Crack-X Powder is a cement-based, non-shrink powder compound formulated for repairing static cracks typically ranging from 5mm up to 20mm in width. It uses specialized additives to prevent shrinkage and cracking as it cures, providing a durable, long-lasting repair that is structurally sound.

Unlike regular cement mortar, which is prone to significant shrinkage and detachment from the crack edges, Dr. Fixit Crack-X Powder offers superior adhesion and minimal volume change. This makes it an essential product for preparing walls and masonry for subsequent waterproofing or painting, ensuring the repair patch remains intact for years.

Why Choose Dr. Fixit Crack-X Powder?

Crack-X Powder is specifically designed for serious structural surface repair, offering key advantages:

• Non-Shrink Formula: Minimizes shrinkage after drying and curing, ensuring the repair patch perfectly fills the crack void and won’t detach.
• High Compressive Strength: Cures hard like concrete, providing mechanical strength superior to polymer-only pastes.
• Ideal for Wide Cracks: Perfectly suited for cracks wider than 5mm and up to 20mm where paste fillers or sealants are inappropriate.
• Excellent Bonding: Adheres tenaciously to brickwork, concrete, and plaster surfaces.

Key Features of Dr. Fixit Crack-X Powder

• Easy to Mix: Requires only the addition of water to form a uniform, workable paste.
• Water Resistant: Provides a durable barrier against moisture ingress once cured.
• Interior & Exterior Use: Suitable for filling cracks on both external facades (before exterior paint) and internal walls.
• Paintable: Provides a rough, textured finish that is easily paintable and compatible with all wall primers and topcoats.

Recommended Application Areas

This cement crack filler is ideally suited for:

• Masonry Cracks: Filling wide static cracks in blockwork and brickwork walls.
• Junction Repairs: Repairing non-moving joints between walls and ceilings.
• Plaster Damages: Repairing large patches of damaged or spalling plaster.
• Concrete Structures: Filling surface cracks and voids in concrete elements.

Technical Specifications: Dr. Fixit Crack-X Powder

How to Apply Dr. Fixit Crack-X Powder (Step-by-Step)

1. Surface Preparation: Clean the crack thoroughly. Chisel the crack into a “V” shape (V-grooving) to ensure good keying. Ensure the crack is clean and dry.
2. Mixing: Slowly add clean water to the Dr. Fixit Crack-X Powder until a uniform, stiff, trowelable paste is achieved. Only mix the amount you can use within the pot life.
3. Application: Press the mixed paste firmly into the V-grooved crack using a narrow trowel or putty knife. Overfill slightly.
4. Finishing: After about 20-30 minutes, when the mix begins to set, trowel the repair patch flush with the surrounding wall surface.
5. Curing: The patch must be moist cured for at least 7 days (spraying with water periodically) for the cement to achieve full strength and minimal shrinkage. See expert tips on repairing wide masonry cracks.

Frequently Asked Questions (FAQ)

Q: Can I use this for hairline cracks (under 5mm)?
A: It is not recommended. For hairline cracks, use a polymer-based paste like Dr. Fixit Crack-X Paste, as they require flexibility, not the cementitious bulk of this powder.

Q: Do I need to apply a primer after using this?
A: Yes, once the patch is fully cured (after moist curing), you should apply a coat of wall primer over the repaired area before applying your final topcoat paint.

Q: Can I mix this with polymer emulsions like URP?
A: While possible, this product is designed to work effectively with just water. For enhanced properties, consider using a specialized product or follow specific instructions for polymer additives.