Flawless Floors Made Simple – With Support From Sika

At Sika, we’re here to help you get the best out of every bag. Sikafloor®-125 Level Flex is a high-performance self-levelling compound designed with professional trades in mind. Follow this simple, step-by-step guide to achieve a durable, smooth finish you can be proud of - first time, every time.

Step 1: Substrate Preparation - Start right, finish
strong.

Before you get mixing, make sure the surface is ready to go. Here's what to check:

For Concrete & Screed (Normal/Porous):

  • Normal Absorbent: No primer needed in most cases. Just dampen the surface with clean water (no puddles!) and let it surface dry.
  • Porous: Clean thoroughly, remove dust, debris, and loose material with a stiff brush or vacuum. Prime with SikaBond® PVA+ (1:4 ratio with clean water). For very porous substrates, apply a second coat once the first is dry to prevent pinholes or cracks.

 

Porous/Concrete Screed:

  • Remove all dust and loose material (preferably with a brush or vacuum).
  • Prime the surface with SikaBond® PVA+ (1 part PVA to 4 parts clean water). Ensure the surface is well coated and allow it to dry.
  • Highly porous surfaces: Apply a second coat of primer if needed to prevent pinholes, cracking, or debonding.


Non-Porous/Dense Substrates (e.g., Quarry Tiles, Terrazzo, Smooth Concrete):

  • Mechanically roughen the surface (e.g., grinding or scarifying) to create a mechanical key. Specialist advice may be required.
  • Alternatively, apply a bonding coat of undiluted SikaBond® PVA+ and let it become tacky before applying Sikafloor®-122 Level Universal.
Sikafloor-125 Level Flex
Sikafloor-122 mix
Step 2: Mixing - Smooth mixing = smooth finish.
  • Use 3.4 – 3.5 litres of clean water per 20kg bag.
  • Always add powder to water, not the other way round.
  • Mix using a slow-speed (<500 rpm) drill and spiral paddle.
  • Mix for at least 3 minutes until smooth and lump-free.

 

Important: Don’t add extra water. If the mix starts to stiffen, don’t rework or remix, just discard it.

Step 3: Application - Now it’s time to lay it down.
  • Pour onto the floor and spread evenly with a steel trowel. Start with a tight scrape coat.
  • Immediately apply more mix to your desired depth.
  • If needed, use a spiked roller (within working time) to smooth the surface and eliminate air bubbles.
  • Max layer thickness: 6 mm per layer.
  • Feather edge-friendly, perfect for smoothing right up to transitions.
  • For additional layers: Allow the first to dry, then prime with SikaBond® PVA+ (1:3 with water) before adding more.

 

⏳ Working time: ~15–20 minutes

🏃‍♂️Walkable in: 2–4 hours

🎯Ready for final floor coverings: ~8 hours at 20°C

sikafloor-122
sikafloor-122
Step 4: Curing - Protect your work, preserve your results.

In warmer conditions:

  • Mist spray lightly to prevent premature drying.
  • Close doors/windows to stop through-draughts, which can cause cracks.

 

Step 5: Clean-Up - Easy in, easy out.

Clean tools immediately after use with clean water, don’t wait for it to harden.

Job Done!

With Sikafloor®-125 Level Flex, you get a reliable, high-quality finish every time - fast, flexible, and tradesperson-approved.