Dr. Fixit
Dr. Fixit Fastflex Plus
Flexible waterproof membrane
Wet areas
Bathroom
Water tanks
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Dr. Fixit Fastflex
Flexible cementitious coating
Dr. Fixit Fastflex is a two-component flexible cementitious waterproof coating. Because it is cement based it bonds into the substrate rather than sitting on it as a film, which is what makes it suitable under tiles and inside tanks where the waterproofing will be permanently buried.
Flexible
Crack bridging
Indoor
Outdoor
| Brand | Dr. Fixit |
|---|---|
| Product type | Flexible cementitious coating |
| Chemistry | Two-component polymer-modified cementitious |
| Supplied as | Powder plus liquid, site mixed |
| Substrates | RCC, Screed, Plaster, Masonry |
| Applications | Bathroom, Wet areas, Water tanks, Basement |
| Pack size & coverage | Per the manufacturer’s current data sheet — ask us for the TDS |
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Product description
Leakproofs by Betterwork specifies and applies Dr. Fixit Fastflex as part of a complete waterproofing system. A material on its own does not stop a leak — what stops it is the right material chosen for the right defect, on a surface that has been properly prepared. That is why we deep-scan before we specify.
Where Dr. Fixit Fastflex is used
This product is specified for bathroom, wet areas, water tanks, basement.
- Bathroom and toilet sunk slabs before filling and tiling
- Shower areas and wall-to-floor junctions
- Water tanks, sumps and reservoirs
- Basement walls treated from the inside
- Balconies and utility areas that will be tiled over
Suitable substrates: RCC, Screed, Plaster, Masonry.
How it is applied
The powder and liquid components are mixed at the ratio given in the data sheet — this is not a product to gauge by eye — and applied by brush in two or more coats at right angles to one another. Corners, junctions and pipe penetrations are reinforced with tape before the final coat, and wet areas are flood-tested before they are filled.
Preparation is the part that decides whether the system lasts. Loose material and failed old coatings are removed, cracks are cut and filled, and the surface is cleaned and brought to the moisture condition the product requires before anything is applied. Skipping that stage is the single most common reason waterproofing fails in its first season, whichever brand is on the tin.
Key properties
- Flexible enough to bridge fine cracks in the substrate
- Bonds into the substrate rather than forming a loose film
- Can be tiled over directly
- Suitable for water-retaining structures
- Works on both internal and external faces
Technical data
Pack sizes, coverage, cure times, colours and current pricing for Dr. Fixit Fastflex are taken from the manufacturer’s current technical data sheet.
Formulations, pack sizes and regional availability change, so we quote against the data sheet in force on the day rather than a figure copied from a website. Ask us for the current TDS and SDS for this product and we will send them with your estimate.
Related waterproofing services
We apply Dr. Fixit Fastflex as part of the following services:
Free inspection & written estimate
Get Dr. Fixit Fastflex specified for your building
Book a free deep-scan inspection. We identify what is actually causing the leak, then recommend the material system that fits — with a fixed written estimate before any work begins.
Dr. Fixit and its product names are trademarks of their respective owner. Leakproofs by Betterwork is an authorized Dr. Fixit applicator. Product information on this page is provided to help you choose a system; always refer to the manufacturer’s current technical data sheet before use.
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Alternatives to Dr. Fixit Fastflex, and the products most often specified alongside it on the same job.
Explore related services and areas
Our services
- Terrace Waterproofing
- Roof Waterproofing
- Bathroom Waterproofing
- Wall Waterproofing
- Basement Waterproofing
- Water Tank Waterproofing
- Balcony Waterproofing
- Swimming Pool Waterproofing
Specialist treatments
- Terrace Waterproofing
- Bathroom & Toilet Waterproofing
- Basement & Underground Tank Waterproofing
- External & Internal Wall Leakage Treatment
- PU & Epoxy Coating Waterproofing
- Injection Grouting (Pressure / Chemical)
- Dampness & Seepage Treatment
- Monsoon Pre-Inspection & Leakage Detection