Painting a concrete floor is one of the most effective ways to improve the appearance, durability and performance of garages, warehouses, worktops, showrooms and commercial premises.
Not all concrete floors behave the same way. A power floated warehouse floor requires a completely different preparation method to a porous garage floor or a damp basement slab.
In this guide, we'll explain:
- How to identify different concrete floor types
- The best preparation methods for each surface
- Which primers and floor paints to use
- Common mistakes to avoid
- How to achieve a professional, long-lasting finish
How to Paint Power Floated Concrete Floors
Power floated concrete is commonly found in:
- Warehouses
- Distribution
- Industrial units
- Manufacturing facilities
- Commercial buildings
This type of concrete is mechanically finished to create a dense, smooth and hard-wearing surface.
The Challenge with Power Floated Concrete
Although extremely durable, power floated concrete has very little surface profile. This makes it difficult for floor paints and coatings to achieve a strong bond.
Applying a coating directly onto untreated power floated concrete can often to lead to premature failure.
Preparing Power Floated Concrete Floors
There a two effective preparation methods:
Option 1 - Mechanical Surface Preparation
Mechanical preparation creates a surface profile that allows coatings to anchor properly.
Common methods include:
- Shot blasting
- Diamond grinding
This is often the preferred option for heavily trafficked industrial environments.
Option 2 - Apply an Adhesion Primer
For many projects, a specialist adhesion primer eliminates the need for mechanical preparation, saving both time and cost.
For light to medium traffic areas:
For heavy-duty environments
Best Paint Systems for Power Floated Concrete
Once primed, choose a coating system based on traffic levels.
Light to Medium Traffic Areas
Apply
Suitable for:
- Garages
- Workshops
- Storage areas
- Light commercial spaces
Heavy-Duty Traffic Areas
Apply:
Benefits include:
- Excellent abrasion resistance
- High chemical resistance
- Durable high-build finish
- Long service life
How to Paint Damp Concrete Floors
Damp concrete floors require a special treatment before painting.
Applying a floor coating to a damp substrate can result in:
- Blistering
- Delamination
- Peeling paint
- Moisture-related coating failure
Damp floors are commonly found in:
- New-build properties
- Basements
- Ground-floor slabs
- Older buildings without an effective damp proof membrane
How to Check if a Concrete Floor is Damp
A simple moisture test can be carried out using polyurethane sheeting.
Tape a 1m² sheet of plastic securely to the floor and leave it for 24 hours.
If condensation forms underneath the plastic, the floor still contains excess moisture and should be treated before painting.
How Long Does Concrete Take to Dry?
As a general rule, concrete dries around:
25mm (1 inch) per month
under normal conditions.
For example:
- 100mm slab = approximately 4 months drying time
- 150mm slab = approximately 6 months drying time
Environmental conditions may increase drying times considerably.
Recommended Coating System for Damp Concrete
Step 1 - Apply a liquid Damp Proof Membrane
Use a:
This creates a moisture barrier that allows floor coatings to be applied even when residual moisture remains in the concrete.
Ste 2 - Apply an Epoxy Floor Coating
Once the DPM has cured, apply:
Benefits include:
- Heavy-duty durability
- Excellent chemical resistance
- Long-term protection
- Easy maintenance
How to Paint Ordinary Dry Concrete
Ordinary dry concrete is typically the easiest surface to paint when properly prepared.
Common applications include:
- Domestic garages
- Workshops
- Utility rooms
- Storage units
- Retail premises
Prepare the Concrete Surface
Before painting
- Sweep and vacuum thoroughly.
- Remove grease, oil and contaminants with a suitable degreaser.
- Repair any cracks or damaged areas.
- Check the floors proximity.
A clean surface is essential for maximum paint adhesion and durability,
How to Check if Concrete is Porous
Spray a small amount of water onto the surface.
If the water soaks in quickly:
- The floor is porous
- A primer may be required
If the water remains on the surface:
- The floor has low porosity
- Direct coating may be possible
Paint System for Light to Medium Traffic
Apply:
First Coat
- AndCoat PU Floor Paint thinned by 5-10%
Follow with:
Second Coat
- Full-strength AndCoat PU Floor Paint
Ideal for:
- Home garages
- Workshops
- Utility rooms
- Light commercial environments
Paint System for Heavy Traffic Areas
For demanding environments, apply:
- Two coats of AndCoat HB Solvent Free Epoxy Floor Paint
Ideal for:
- Warehouses
- Vehicle workshops
- Manufacturing facilities
- Commercial premises
Benefits include:
- Superior ware resistance
- Excellent chemical protection
- High-build finish
- Easy cleaning and maintenance
What if the Concrete Floor is Highly Porous?
Highly porous concrete can absorb large quantities of paint, leading to poor coverage and reduced coating performance.
To prevent this:
Step 1
Step 2
Allow the primer to cure fully
Step 3
Apply your chosen AndCoat HB Epoxy Floor System
This will help achieve consistent coverage, improved adhesion and maximum durability.
Choosing the Right Concrete Floor Paint Colour
Floor paint doesn't just protect your surface. It can also transform the appearance of your workspace.
We offer:
- Over 72,000 colour options
- RAL colour matching
- British Standard (BS) colour matching
- Bespoke colour matching services
Where you're creating a clean industrial finish or matching company branding, we can supply the right colour for your project.
Professional Concrete Floor Preparation & Installation Services
For larger commercial and industrial projects, we also offer a complete floor preparation and installation services.
Our services include:
- Shot blasting
- Diamond grinding
- Surface moisture testing
- Floor coating specification
- Professional application
Our experience team will assess your floor and recommend the most suitable system based on:
- Traffic levels
- Chemical exposure
- Moisture conditions
- Desired finish
- Budget requirements
Frequently Asked Questions
Can you paint directly onto concrete?
Yes, provided the concrete is cleaned and properly prepared. Some surfaces may also require a primer or damp proof membrane before painting.
What is the best paint for a garage floor?
For light domestic use, a PU floor paint is often suitable, For higher traffic levels and maximum durability, a solvent-free epoxy floor coating is usually the best option.
Can you paint power floated concrete?
Yes. However, power floated concrete generally requires either mechanical preparation or a specialist adhesion primer before painting.
Can you paint damp concrete?
Yes. A suitable damp proof membrane should be applied first to prevent moisture from causing coating failure.
How long does painted concrete flooring last?
When properly prepared and coated using a high-quality epoxy system, a painted concrete floor can last for many years, even in demanding commercial and industrial environments.
Final Thoughts
Painting a concrete floor isn't difficult when the correct preparation and coating system are used.
Where you're working with power floated concrete, damp concrete or ordinary dry concrete, choosing the right primer, damp proof membrane and floor paint will help ensure a long-lasting, professional finish.
By following the guidance above, you can create a durable, attractive surface capable of withstanding years of traffic, wear and chemical exposure.
Need help choosing the right concrete floor paint system? Contact our technical team today for expert advice on preparation, moisture testing and product selection.
