BITUTHENE® Primer B1 (UK/IE Version)

Quick drying all temperature primer to enable same hour application of BITUTHENE® membranes

Product Description

GCP Applied Technologies (“GCP”) BITUTHENE® Primer B1 is a solvent based bituminous primer used to prepare substrates where BITUTHENE® GP membranes are to be applied.

Typical Use

BITUTHENE® Primer B1 is used to prime dry concrete, dry wood and dry metal surfaces to which BITUTHENE® membranes are to be applied Note: BITUTHENE® Primer B1 is not suitable for application to green concrete, wet or any damp to touch surfaces.
BITUTHENE® B1 Primer can be used at +5°C and above.

Product Advantages

  • Application at temperatures of +5 °C and above
  • Specifically formulated to provide enhanced adhesion with BITUTHENE® GP membrane 
  • High coverage – Low cost per square metre
  • Rapid drying
  • Ideal for winter use

System Components

Surface Primer

BITUTHENE® Primer B1 is a companion product that is specifically designed to promote high bond of listed GCP BITUTHENE® membranes.

Membranes (complete information on these membranes can be found on the GCP website at


Safety and Handling Information

Users must read and understand the product label and safety data sheet (SDS) for each system component. All users should acquaint themselves with this information prior to working with the products and follow the precautionary statements. SDSs can be obtained by contacting your local GCP representative or office, and in some cases from our web site at


  • All products must be handled and stored consistent with BITUTHENE® Primer B1 methods statement
  • All product should be stored in a well ventilated space, upright in its original container
  • Observe one-year shelf life 
  • Store in dry conditions below 40ºC
  • Store off ground, under tarps or otherwise protected from rain and ground moisture.


Technical Support, Details and Technical Letters

The most up to date detail drawings and technical letters are available at or in the applicable Method Statement. For complete application instructions, please also refer to the current GCP Applied Technologies Contractor Handbook and Literature on ( Documents in hardcopy as well as information found on websites other than may be out of date or in error. Before using this product, it is important that information be confirmed by accessing and reviewing the most recent product information, including without limitation product data sheets and contractor manuals, technical bulletins, detail drawings and detailing recommendations. For technical assistance with detailing and problem solving please contact your local GCP representative or office. 


BITUTHENE® Primer B1 may be applied by a roller or a brush. Apply to clean, dirt free, surfaces at a coverage rate of 8-10 m2 per litre. Allow the primer to dry 30 minutes or until tack-free. Dry time may be longer in cold temperatures. Deep puddles of primer should be avoided as this will lengthen drying time.
Do not apply directly to BITUTHENE® membranes.

Priming should be limited to an area that can be covered with membrane on the same day. Areas that accumulate dust or dirt must be re-primed before membrane is applied.

Key Data

VOC ≤540g/l
Curing at 20 °C 30 minutes


BITUTHENE® Primer B1 5 & 25 litre can
Coverage 8-10 m2 per litre* | United Kingdom customer service: +44 (0) 1480 478421

We hope the information here will be helpful. It is based on data and knowledge considered to be true and accurate, and is offered for consideration, investigation and verification by the user, but we do not warrant the results to be obtained. Please read all statements, recommendations, and suggestions in conjunction with our conditions of sale, which apply to all goods supplied by us. No statement, recommendation, or suggestion is intended for any use that would infringe any patent, copyright, or other third party right.

BITUTHENE is a trademarks, which may be registered in the United States and/or other countries, of GCP Applied Technologies Inc. This trademark list has been compiled using available published information as of the publication date and may not accurately reflect current trademark ownership or status.

© Copyright 2020 GCP Applied Technologies Inc. All rights reserved.

This document is only current as of the last updated date stated below and is valid only for use in the United Kingdom. It is important that you always refer to the currently available information at the URL below to provide the most current product information at the time of use. Additional literature such as Contractor Manuals, Technical Bulletins, Detail Drawings and detailing recommendations and other relevant documents are also available on Information found on other websites must not be relied upon, as they may not be up-to-date or applicable to the conditions in your location and we do not accept any responsibility for their content. If there are any conflicts or if you need more information, please contact GCP Customer Service.

Last Updated: 2022-11-24