Kenbro Bitumen Primer BF4 20 Litres – Solvent Based Waterproofing Primer in Nairobi
A solvent based bitumen primer that seals and prepares concrete surfaces before bitumen waterproofing membranes, emulsions and coatings. Also used for coating and protecting metal. Available at Shabbiri Hardware, Magadi Road, Ongata Rongai and Tuala.
Product Overview
Kenbro Bitumen Primer BF4 is a Kenyan-made, solvent based bitumen primer from Kenbro Industries Ltd, Nairobi. It penetrates porous concrete and screed, binds loose dust and creates a sticky bitumen-rich base that helps torch-on membranes, self-adhesive membranes and bitumen paints bond firmly to the roof or slab.
Use it on flat concrete roofs, balconies, terraces, foundations, retaining walls, water tanks, bathrooms and wet areas before any bitumen waterproofing layer. It also gives steel and metal surfaces a protective anti-corrosion coat. Supplied in a sealed 20 litre jerrycan for contractors, fundis and DIY homeowners across Nairobi, Rongai, Kajiado and Kitengela.
Technical Specifications
| Brand | Kenbro |
|---|---|
| Product Code | BF4 |
| Product Type | Solvent based bitumen primer |
| Pack Size | 20 litre jerrycan |
| Base | Bitumen in solvent carrier |
| Colour | Black |
| Coverage | Approximately 0.15 litres per square metre per coat, depending on surface porosity |
| Recommended Coats | Two coats, second coat applied at right angles to the first |
| Application Method | Brush or roller |
| Suitable Surfaces | Concrete, screed, plaster, masonry and metal |
| Tool Cleaning | Thinner, while the primer is still wet |
| Shelf Life | 12 months from date of manufacture in the sealed container |
| Hazard | Flammable – keep away from flames and sparks |
| Manufacturer | Kenbro Industries Ltd, Nairobi, Kenya |
Key Features & Benefits
Stronger Membrane Bond
Creates a tacky bitumen base so torch-on and self-adhesive membranes stick firmly and do not lift.
Deep Penetration
The solvent carrier soaks into porous concrete, sealing pores and locking down surface dust.
Metal Protection
Doubles as a protective coating for steel and metal surfaces exposed to moisture.
Easy to Apply
Brush or roll on thinly. No mixing or special equipment needed on site.
Where to Use
How to Use
Prepare the surface
The surface must be smooth, clean and dry, with no dust, grease, polish or loose material. Sweep and wash off dirt and let it dry.
Allow new concrete to cure
Give new concrete floors and plaster enough time to dry out fully. Do not prime where there is rising damp.
Stir well
Stir the primer thoroughly before use so the bitumen is evenly mixed.
Check earlier coatings
Any previous emulsion or bitumen coating must be fully dried and cured before priming over it.
Apply the first coat
Use a brush or roller and apply a thin, even coat. Lay it on smoothly and gently; do not rub it into the surface.
Apply the second coat
Let the first coat dry, then apply the second coat at right angles to the first for full, even coverage.
Waterproof and clean up
Once dry, lay your bitumen membrane or coating. Clean brushes and rollers with thinner while still wet.
Safety & First Aid
- Flammable – no smoking, open flames or welding nearby during use and drying.
- Avoid contact with eyes. If contact occurs, rinse immediately with plenty of clean water.
- Use in well-ventilated areas and wear gloves and eye protection.
- Keep the container tightly closed and store in a cool, shaded place away from children.
Frequently Asked Questions
How many square metres does a 20 litre jerrycan cover?
About 130 square metres for a single coat on average concrete. With the recommended two coats, plan for roughly half that area. Rough or very porous surfaces use more.
Do I need primer before a torch-on membrane?
Yes. A bitumen primer seals the concrete and gives the membrane a surface it can bond to, which reduces lifting, blisters and leaks.
Can I apply it on a damp surface?
No. The surface must be dry, and areas with rising damp should be treated before priming.
Can it be used on metal?
Yes. BF4 is also suitable as a protective coating for metal surfaces.
Where can I buy Kenbro Bitumen Primer in Nairobi?
At Shabbiri Hardware on Magadi Road, at our Ongata Rongai branch opposite Hashi Petrol Station and our Tuala branch past Nazarene University. We also take orders on WhatsApp.
Visit Shabbiri Hardware
Ongata Rongai Branch
Magadi Road, opposite Hashi Petrol Station, Ongata Rongai
Tuala Branch
Magadi Road, past Nazarene University, Tuala
