Cementos Molins

How to correctly seal water leaks

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In order to block water leaks in areas subject to the pressure from this water, like tanks, pipes, tunnels, etc., it is necessary to use quick setting materials that interrupt the water flow instantly.
The solution in these cases is to use PROPAM® TAPAVÍAS, an easy-to-apply, extra quick setting mortar which, due to its technical characteristics, is appropriate for this type of repairs.

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The holes or cracks must be cleaned with high pressure water in order to remove all loose particles and dust.

Moisten the substrate before applying PROPAM® TAPAVÍAS.

Trim the sides of the hole or crack at a right angle, avoid leaving “V” shaped sections, to ensure better adhesion.


Add in a rubber container the quantity of water necessary to knead PROPAM® TAPAVÍAS (about 140 cm3 per 500 g)

Knead energetically and quickly with the gloved hand to obtain a homogeneous consistency free of lumps.

Keep the paste on the glove until it has a firm but plastic consistency (beginning of setting).

Apply directly to the water outlet and maintain pressure for about 60 seconds.

Remove any leftover material so that the repair is levelled evenly with the surface surrounding the substrate.

Keep the repair moist for about 15 minutes.


  • Do not apply in rainy conditions, nor with temperatures below + 5 ° C or above + 30 ° C.
  • It is necessary to use individual protection elements (gloves, protective glasses, etc.) for the application of the material.
  • Use PROPAM® CEM RAPID for the detention of light water leaks in buried structures.



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