Makes mortar set in seconds!

Sika 4a Waterstop is a liquid additive which when mixed with cement results in mortar setting in seconds. Ideal for making a 'plug' of mortar to stop leaks in basements before putting a waterproof slurry or lining system in front.

Fast set additive for cement. Mix in a gloved hand with cement and push firmly into a weeping water hole to stop the water. Reminiscent of the boy with his finger in the dyke, this really does the job!

DIY Applications

• Mortar fast set additive
• Cement fast set additive

Professional Applications

• Sealing against high and moderate water pressure infiltrations in concrete, rock or masonry.
• Allows Sika 1 renders, gunite or shotcrete to be applied on structures exposed to running surface water.

DIY Benefits

• Ready to use
• Rapid setting time
• Just add water and portland cement
• Well proven
• Contains no chlorides
• Suitable for potable water contact

How to Step-by-Step

1. Mix in a gloved hand with cement.
2. Push firmly into a weeping water hole to stop the water.