Multi coloured wet pour surfacing used by a school
Rubber Flooring

A guide to using a forced action mixer for wet pour flooring

Advice for using a forced action mixer for wet pour flooring

To create wet pour rubber flooring, a safety surfacing installer needs a quality forced action mixer to ensure a quality job.

There are several characteristics that make the difference to an installer. This blog post takes a look at what they are and how to use a mixer to make the job easier.

SoRoTo 120L Forced Action Mixer On Site
SoRoTo 120L Forced Action Mixer On Site.

What is wet pour rubber?

Wet pour rubber is an attractive, impact absorbing and low maintenance rubber crumb safety surface.

This two-layered system is created using an SBR sub-base topped with a coloured EPDM layer to create a vibrant and safe surface which cures after around 24-48 hours dependent on the outside temperature.

Once mixed using the forced action mixer, it can be easily spread, levelled and finished off using trowels.

It is versatile: The vibrant colours, safety and cushioning make wet pour rubber a versatile solution for use in a range of applications.

It is vibrant: The bright and varied range of colours available will give you a vibrant surfacing solution.

It is permeable: Wet pour rubber allows surface water to drain away naturally and help prevent localised flooding.

It is low maintenance: It is easy to maintain by following steps such as wearing suitable footwear, brushing or washing using soap and hot water.

It is UV stable: The addition of UV stable binder means that the surface will not fade away in the sunlight.

It enables variation: Over 20 EPDM rubber crumb variants are available to meet individual wants and needs.

It is safe: It can provide a fall height of 1.4 metres.  

Wet Pour Flooring can be used in a variety of places
Wet Pour Flooring can be used in a variety of places.

What to look for when choosing a mixer for wet pour installations

There are several things to consider when choosing a forced action mixer:

  • Easy to move on site
  • Easy to transport
  • Capacity of the mixer
  • Easy to clean
  • Mixer speed
  • Life expectancy
  • Stability
  • Safety
  • Reliability
Soroto Forced Action Mixer
Consider the versatility when choosing a mixer for wet pour flooring installations.

What other tools are needed for wet pour installations?

It is important that all tools needed for the job are loaded into the van prior to starting. A failure to ensure this could lead to insufficient working practices and delays could occur.

Below is a list of equipment that is typically required for any installation:

  • Wheel barrow
  • Wooden screed rails
  • Aluminium straight edge
  • Spazzle
  • Various shaped hand float/trowels
  • Roller(s)
  • Digital thermometer
  • Drum stand
  • Drum tap
  • Measuring scales
  • Buckets for measuring binder and cleaning floats
  • PPE: e.g. gloves, protective sleeve covers, safety glasses, respirator
Soroto 100L with wheelbarrow
A wheelbarrow should be used alongside the mixer to help transport materials to site.
Trowels are used to smooth the area before the curing time runs out.
Trowels are used to smooth the area before the curing time runs out.

Using a forced action mixer for wet pour installations

A neat and well organised mixing area should be established, including where viable, using plastic sheets to protect the existing surface from contamination and damage.

Climate conditions should be taken into consideration when mixing material. In hot and humid conditions, the mix should take place in the shade or under covers to prevent an accelerated cure and to ensure that the material stays workable for as long as possible. 

In order to achieve a homogeneous and even surface, materials must be accurately measured and thoroughly mixed in a forced action pan mixer for three minutes before application. Each mix must be mixed for the same time as this is crucial for consistency. 

The user should never mix only part of a bag and if multiple batches are delivered to site, always mix at a consistent ratio.

E.g. if three tonnes of coloured EPDM has been delivered to site and two tonnes are from batch one and one tonne is from batch two, then add to the mixer at a ratio of 2:1, each and every time.

This is even more crucial when installing Conipave RA andcolour coated rubber mulch. Though great care is taken to produce these products using recycled materials, no two batches are the same.

SoRoTo forced action mixer spare parts
There are factors to conside before mixing the EPDM and the binder.

Rubber Granules


Binder % by Weight

1 bag



Litres / bag

CT 4010

(EN1177-2018 Certified)

CP 4020




CT 2060

CP 4020




CP 4051




Coloured EPDM

CP 4020




CP 4051




CP 4080




CP 4090




Black EPDM

CP 4020




CP 4051




Installing the wet pour layer

Once the below surface has been prepared and membranes have been laid to prevent weeds rising to the surface, it is time to install a safety surface.

When installing a single layer, it is recommended a minimum thickness of 20mm and this can be installed directly onto an asphalt or concrete sub-base.

The sub-base and all edges must be 100% primed. When the safety surface is being laid onto a new concrete or asphalt, it must be  cured fully as any excess moisture (from concrete) and oils (from asphalt) will affect the primer and break the bond between the sub-base and EPDM layer.

Step-by-step installation guide:

  1. Prime the concrete / asphalt sub-base.
  2. Set up the mixing area and place appropriate ground cover when necessary.
  3. Turn the force action pan mixer on.
  4. Empty the EPDM into the mixer.
  5. Measure / weigh off the binder.
  6. Pour the binder into the mixer and leave it to mix until the rubber is fully and evenly coated. Recommended for three minutes.
  7. Mixed materials should be transported to the working area by wheel barrow and poured out in small piles, ready to be screeded.
  8. Screed and level the EPDM at a thickness of 23mm.
  9. Float the EPDM down by 3mm, using either a hand float or a medium, 9.4kg roller.
  10. Repeat steps 8-10 until you finish or stop at a planned break point.
  11. Once finished, leave the EPDM wearing layer to cure fully.
Black And Red Wet Pour Flooring On Playarea
Black And Red Wet Pour Flooring On Playarea

Browse wet pour surfacing

To browse the range of 20+ EPDM colours, click the link below.

View EPDM granules and binders

SoRoTo forced action mixers

Every SoRoTo machine has been manufactured to the highest quality to enable it to withstand the toughest environments that machinery can face on sites. Their efficient but quiet motors and durable designs make these upright pan mixers the perfect machine for contractors who need efficient and reliable, high-capacity output machines.

The mixers in our range were built for portability. They are designed to be narrow, light and able to fit through standard doorways and upstairs, when needed.

They are completed in just under four minutes per load, which saves time compared to traditional rotary drum mixers.

SoRoTo 80L This mixer is designed to fit through most standard doorways and transported easily to the exact area of working. With easy-load transportation rollers on the top of the machine, loading into the back of a van or onto a pickup flatbed is simple and can be done quickly, by a single person.

SoRoTo 100L: Ideal for contractors who have a requirement for mixing larger amounts (up to 240kg approximately) of materials. The 100L is light and narrow enough to fit through standard doorways.

SoRoTo 200L: With a mixing capacity of 468kg, service life of up to 20 years and the accessibility to be able to use the mixer on uneven surfaces, the 200L will save time and money. It is incredibly versatile being suitable for multiple jobs. The lightweight frame and adjustable legs mean it is ideal to reach hard-to-access areas.

SoRoTo 80L Forced Action Mixers
SoRoTo 80L
Soroto 100L Forced Action Mixer
SoRoTo 100L


Wet Pour Rubber is ideal for play areas, playgrounds, adventure parks, paths and walkways, and leisure centres.

It is easy to install by using a forced action mixer which can be taken with ease to sit and can be used within minutes.

The SoRoTo range of forced action mixers are built for portability; they are lightweight, fitted with wheels and are small in height to fit through standard doorways.

Once the mix is installed it cures quickly in just 24-48 hours.

Download the full installation guide here.

To find out more information call our helpful and friendly team on 01246 418144.

Alternatively, contact us on webchat or email us here.

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