Dr. Fixit Crack-X Paste (201)
A single-pack, ready-to-use fibre-reinforced acrylic putty that fills cracks up to 5 mm in plastered internal and external walls.
Dr. Fixit Crack-X Paste (201) at a glance
The essentials specifiers and contractors ask first — answered straight from the product data, with links to go deeper.
What is it?
Dr. Fixit Crack-X Paste (product code 201) is a single-pack, ready-to-use, fibre-reinforced flexible putty made from acrylic emulsion polymer, graded fillers and micro-fibres. It is a crack-repair paste for plastered masonry walls, not a waterproofing membrane coating.
Where is it used?
Filling cracks up to 5 mm wide in internal and external plastered brick-masonry walls before painting. It is a surface crack-repair material for walls, not a terrace, roof or facade waterproofing system.
Why use it?
It seals plaster cracks permanently with an elastic, fibre-reinforced fill that flexes with minor crack movement instead of popping out like rigid wall putty, giving a smooth, paintable, durable repair and stopping water ingress and damp patches at the crack.
How is it applied?
Widen the crack into a small V-groove, clean and dampen it, then press the ready paste firmly into the groove with a spatula or putty knife and finish flush. A 1:1 paste-to-water dilution can be used as a primer; the repair is over-coatable with polymer paint after about 6 hours.
Key advantages
- Single-pack and ready-to-use - no liquid-plus-powder mixing, no cement to add, so no on-site batching errors
- Fibre-reinforced elastic fill that flexes with minor crack movement instead of cracking again like rigid putty
- Fills cracks up to 5 mm wide in one repair after V-grooving
- Good adhesion to cementitious plastered surfaces, internal and external
- Good water resistance at the repaired crack line, helping prevent damp patches
- Paintable - over-coatable with polymer/emulsion paints, giving a smooth finished wall
- Water clean-up of tools and low odour, suitable for occupied interiors
- Compact pack sizes (from 300 g up to 5 kg) make it economical for small, targeted repairs
Specifications
- Product code: 201 (Dr. Fixit Crack-X Paste)
- Type: Single-pack, ready-to-use fibre-reinforced acrylic emulsion polymer paste (putty)
- Appearance: White paste with fibre
- Crack width limit: Fills cracks up to 5 mm wide in plastered brick-masonry walls
- Coverage: Approximately 25-30 running metres per kg at a 5 mm x 5 mm crack section
- Density: 1.38-1.46 g/ml at 30 deg C
- Solid content: 78-82 percent
- Elongation: 60-70 percent
- Tensile strength: 12 MPa
- Hardness: Shore A 70-75
- Shrinkage: 18-20 percent
- Tack-free time: 10-30 minutes
- Over-coating (paint): Paintable with polymer paints after about 6 hours
- Standard: Meets ASTM C 834-91
- Pack sizes: 300 g, 500 g, 1 kg and 5 kg
- Shelf life: 12 months from date of manufacture in original sealed packs
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About Dr. Fixit Crack-X Paste (201)
A plain-language overview of what Dr. Fixit Crack-X Paste (201) is, the problem it solves and how Space Arc Engineering positions it in a specification.
Dr. Fixit Crack-X Paste, carried under the manufacturer's product number 201, is a building-repair material from Pidilite's Dr. Fixit range. It arrives as a single-pack, ready-to-use white paste based on a weather-durable acrylic emulsion polymer loaded with graded fillers and reinforcing micro-fibres. There is no liquid-plus-powder mixing and no cement to add on site - the contractor opens the pack and applies it directly, which removes batch-to-batch mixing errors and speeds up small repair jobs.
The product solves a very specific, very common problem: fine to moderate cracks that appear in cement plaster on internal and external masonry walls. Ordinary wall putty and cement slurry are rigid and tend to crack again at the same line because they cannot flex; Crack-X Paste stays elastic and is fibre-bridged, so it accommodates the small seasonal and thermal movements that open and close plaster cracks. It is rated to fill cracks up to 5 mm wide and gives a smooth, paintable surface once cured.
Space Arc Engineering supplies Dr. Fixit Crack-X Paste and can advise on correct surface preparation and where it does - and does not - belong in a repair specification. It is important to position this product accurately: 201 is a crack-filling paste for plastered walls, and it should not be confused with two-component acrylic-cement waterproofing membranes (such as Dr. Fixit's Powercrete or Pidifin 2K ranges) that are used on terraces, roofs and water-retaining structures.
The technical insight
Why Dr. Fixit Crack-X Paste (201) behaves the way it does — the mechanism behind the performance, in specifier-friendly terms.
Crack-X Paste works on a polymer-and-fibre principle rather than a hydraulic-cement one. The continuous acrylic emulsion polymer film is the binder: as the water phase evaporates, the polymer particles coalesce into a tough, slightly elastic solid that grips the plaster on both faces of the crack and moves with it instead of debonding. Dispersed micro-fibres act as internal reinforcement, distributing stress across the fill and bridging the crack so a single seasonal movement does not split the repair. Because it is acrylic-based it also offers good water resistance at the repaired line and bonds well to cementitious substrates.
Where Dr. Fixit Crack-X Paste (201) is used
Typical applications Dr. Fixit Crack-X Paste (201) is specified for, supplied by Space Arc Engineering across Delhi NCR, Ghaziabad, Noida and Uttar Pradesh.
- Filling cracks up to 5 mm wide in internal plastered brick-masonry walls before painting
- Filling cracks up to 5 mm wide in external plastered walls exposed to weather
- Repairing plaster cracks at window and door reveals and corners on masonry walls
- Sealing fine plaster cracks that cause damp patches and paint flaking on walls
- Pre-paint crack repair as part of an interior or exterior repainting cycle
- Touch-up crack repair during building maintenance on plastered surfaces
Key advantages
The properties that make Dr. Fixit Crack-X Paste (201) the right choice — drawn from the manufacturer's product literature.
- Single-pack and ready-to-use - no liquid-plus-powder mixing, no cement to add, so no on-site batching errors
- Fibre-reinforced elastic fill that flexes with minor crack movement instead of cracking again like rigid putty
- Fills cracks up to 5 mm wide in one repair after V-grooving
- Good adhesion to cementitious plastered surfaces, internal and external
- Good water resistance at the repaired crack line, helping prevent damp patches
- Paintable - over-coatable with polymer/emulsion paints, giving a smooth finished wall
- Water clean-up of tools and low odour, suitable for occupied interiors
- Compact pack sizes (from 300 g up to 5 kg) make it economical for small, targeted repairs
Limitations & considerations
Where Dr. Fixit Crack-X Paste (201) is not the right answer. Check these constraints from the manufacturer before specifying — using it outside its scope is the most common cause of failure.
- Not a waterproofing membrane - it is a crack-filling paste and must not be specified for terrace, roof, parapet, facade or water-tank waterproofing
- Per the manufacturer, it should not be used for cracks more than 5 mm wide
- Per the manufacturer, it is not for cracks in structural members, expansion joints or separation gaps - those need a designed movement-joint sealant
- It is for plastered brick-masonry walls; it is not a structural crack-injection or load-restoring repair (active/structural cracks need grouting or an engineered repair)
- Being water-based, it needs the crack cleaned and the repair protected from rain and standing water until it has set and been over-coated
Selection & best practice
How to decide whether Dr. Fixit Crack-X Paste (201) fits your job — and how to apply it so the repair lasts.
Specify Dr. Fixit Crack-X Paste when you need a quick, durable, paintable fill for non-structural plaster cracks up to 5 mm on internal or external walls and you want something more flexible than cement-based wall putty. If the crack is wider than 5 mm, is in a structural member, or is an expansion/separation joint, choose a designed joint sealant or a structural repair instead. If the actual requirement is terrace, roof, or facade waterproofing, do not use 201 - move to a proper membrane system such as Dr. Fixit Powercrete or Pidifin 2K and ask Space Arc to re-scope the specification.
Application best practice
- Widen hairline cracks into a clean V-groove (typically around 3-5 mm) so there is a mechanical key for the paste rather than smearing it over a closed crack
- Remove loose plaster, dust and laitance from the groove and lightly dampen the surface before filling
- Where a primer coat is wanted, dilute the paste roughly 1:1 with water and apply into the groove first, then fill with neat paste
- Press the paste firmly into the groove with a spatula or putty knife so it is fully compacted, then strike it off flush with the wall
- Allow the manufacturer's recoat interval (paint over-coating after about 6 hours) before applying emulsion or polymer paint
- Protect the fresh repair from rain and standing water until it has set and been over-coated
Specifications
Indicative properties from the manufacturer's literature. Always confirm batch-specific values against the current TDS before specification.
| Product code | 201 (Dr. Fixit Crack-X Paste) |
|---|---|
| Type | Single-pack, ready-to-use fibre-reinforced acrylic emulsion polymer paste (putty) |
| Appearance | White paste with fibre |
| Crack width limit | Fills cracks up to 5 mm wide in plastered brick-masonry walls |
| Coverage | Approximately 25-30 running metres per kg at a 5 mm x 5 mm crack section |
| Density | 1.38-1.46 g/ml at 30 deg C |
| Solid content | 78-82 percent |
| Elongation | 60-70 percent |
| Tensile strength | 12 MPa |
| Hardness | Shore A 70-75 |
| Shrinkage | 18-20 percent |
| Tack-free time | 10-30 minutes |
| Over-coating (paint) | Paintable with polymer paints after about 6 hours |
| Standard | Meets ASTM C 834-91 |
| Pack sizes | 300 g, 500 g, 1 kg and 5 kg |
| Shelf life | 12 months from date of manufacture in original sealed packs |
Coverage, dosage, pack sizes and cure times vary with substrate and conditions — request the full TDS for certified technical data.
Industry use cases
Real-world scenarios where Dr. Fixit Crack-X Paste (201) is the practical choice — the teams who reach for it and the jobs it does for them.
- Residential repainting - filling settlement and shrinkage plaster cracks on flat and house walls before emulsion paint
- Commercial and office maintenance - quick, paintable repair of plaster cracks during periodic redecoration
- Builder/developer handover snagging - closing plaster cracks on internal and external walls before final paint
- Facility management - routine crack touch-ups on plastered external walls to keep out damp
- Painting contractors - a flexible alternative to rigid wall putty for cracks that keep reopening
Frequently asked questions
Common questions about specifying and sourcing Dr. Fixit Crack-X Paste (201).
What is Dr. Fixit Crack-X Paste (201)?
It is a single-pack, ready-to-use, fibre-reinforced flexible acrylic putty (product code 201 in the Dr. Fixit range) for filling cracks up to 5 mm wide in internal and external plastered brick-masonry walls. It is a crack-repair paste, not a waterproofing membrane.
Is Crack-X Paste a waterproofing coating for terraces or roofs?
No. This is a common confusion. Code 201 is a wall crack-filling paste for plastered masonry. For terrace, roof, parapet, facade or water-tank waterproofing you need a membrane system such as Dr. Fixit Powercrete or Pidifin 2K - Space Arc can specify the correct product.
What size of crack can it fill?
It is designed for cracks up to 5 mm wide in plastered walls. The manufacturer states it should not be used for cracks wider than 5 mm, or for cracks in structural members, expansion joints or separation gaps, which need a designed joint sealant or structural repair.
Do I need to mix it with cement or water?
No cement and no mixing - it is single-pack and ready to use straight from the container. If you want a primer coat, you can dilute the same paste about 1:1 with water and apply it into the groove first, then fill with the neat paste.
How is it applied and when can I paint over it?
Cut a V-groove along the crack, clean and lightly dampen it, then press the paste firmly into the groove with a spatula or putty knife and finish flush. It can be over-coated with polymer/emulsion paint after about 6 hours.
Why use it instead of ordinary wall putty?
Ordinary cement-based putty is rigid and often cracks again at the same line. Crack-X Paste is acrylic and fibre-reinforced, so it stays elastic and bridges minor crack movement, giving a more durable repair that resists re-cracking and water ingress at the line.
What pack sizes are available and what is the shelf life?
It is available in 300 g, 500 g, 1 kg and 5 kg packs, which suits small targeted repairs. Shelf life is 12 months from the date of manufacture in original sealed packs. Contact Space Arc Engineering for current availability and the full TDS.
References
Manufacturer and technical sources this page draws on. Always confirm current data against the live TDS before specification.
Source Dr. Fixit Crack-X Paste (201) for your project
Space Arc Engineering is an authorised distributor for Dr. Fixit, serving Delhi NCR, Ghaziabad, Noida and Uttar Pradesh. Talk to us for pricing, the technical data sheet and on-site support.
Or email info@space-arc.com · www.space-arc.com