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Frequently Asked Questions
What makes these cements different?
They set while water is running.
Ordinary cement washes out first.
These reach initial set in minutes.
And they expand slightly as they harden.
That expansion is the mechanism.
Why does expansion matter?
A shrinking plug leaves a gap.
That gap is at the sealing interface.
So the leak simply resumes.
Expanding material wedges into the void.
It tightens rather than pulling away.
What are they used for?
Active leaks, while water is flowing.
Basement walls and construction joints.
Cracks in retaining structures.
Tanks, manholes and tunnel linings.
Situations nothing else addresses.
How is it applied?
Mixed in very small quantities.
Working time is only minutes.
Worked to a putty as it warms.
Pressed firmly into the leak.
And held until it takes hold.
How long must it be held?
Typically half a minute to two minutes.
Firm steady hand pressure throughout.
Release it early and water pushes it out.
That is the commonest failure.
Wait for it to stiffen fully.
Does preparation help?
Considerably, yes.
Undercut the crack or hole first.
Make it wider inside than out.
The plug then keys against the opening.
Water pressure holds it in rather than out.
Does this waterproof the structure?
No, it repairs one point.
A plugged leak is a local fix.
Several leaks indicate a condition.
That needs addressing properly.
Membranes and tanking are elsewhere here.