MasterSeal P 691 - A single component, solvent-based primer, moisture curing, for use below and on MasterSeal membranes 


MasterSeal P 691 is a single component, moisture curing polyurethane primer. It contains solvents. 

Where is MasterSeal P 691 applied?

MasterSeal P 691 is designed for use as an adhesion promoting primer on MasterSeal membranes. Its uses include the application of a new membrane to an aged membrane e.g. in repair applications. It can also be used on aged membranes when renewing or repairing the UV protective top coat.

MasterSeal P 691 can also be used as a primer on sand broadcast epoxy primers prior to the application of a spray applied membrane in applications where the membrane is permanently exposed to water. 

What are the advantages of MasterSeal P 691?

excellent adhesion to aged membranes especially in applications where the membrane is permanently exposed to water 

  • rapid cure 
  • long re-coating interval 
  • low viscosity 
  • low consumption 
  • easy to apply 

Product Information

Technical Data Sheet

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MasterSeal P 691_TDS

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