Primer for use with the BITUTHENE® and PREPRUFE® 800PA range of cold applied, self adhesive waterproof membranes

Product Description

BITUTHENE® Primer W2 is a water-based surface conditioner specifically formulated to prepare concrete, masonry and wood surfaces for the Systems. Primer W2 is a low VOC water-based alternative primer for all GCP post applied membranes if needed by local site requirement or specification.

Product Advantages

  • Application temperature above 0°C
  • Damp concrete application
  • Water Based
  • Latex formulation
  • Low VOC


This primer is suitable for use on damp to touch substrates, but it cannot be used to prime “green” concrete. It can be used on masonry or wood surfaces on which all GCP post applied membranes will be applied. Primer W2 can be used at 0°C or above.


BITUTHENE® Primer W2 is supplied ready to use. Do not dilute with water or solvents. BITUTHENE® Primer W2 may be applied by a roller or brush. Apply it to clean, dirt free, frost-free surfaces at a coverage rate of 9-11 m2 per litre. Allow surface conditioner to dry completely and thoroughly prior to membrane application.

The surface conditioner is considered dry when the substrate returns to its original colour. To test for dryness, rub small conditioned area by hand. Wet conditioner will ball up under the fingertips. Allow to dry until conditioner cannot be rubbed off. If conditioned areas are not covered that day, re-condition the area if there is significant dust or dirt contamination.

Health and Safety

BITUTHENE® Primer W2 must be handled properly and stored in well ventilated place Read the product label and Safety Data Sheet (SDS) before use. Users must comply with all risk and safety phrases. SDS’s can be obtained from GCP Applied Technologies or from our web site at

Key Data

Property Typical Value
VOC 25 g/L
Curing at 20°C 60-90 minutes


BITUTHENE® Primer W2 5 litre can
Coverage 9-11 sq m per litre*
* Depending upon method of application, surface porosity and ambient temperature

All declared values shown in this data sheet are based on test results determined under laboratory conditions and with the product sample taken directly from stock in its original packing without any alteration or modification of its component parts. | 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 trademark, 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 2018 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