Product Description
SILCOR® PMMA Concrete Sealer is a two component, fast curing, high strength methyl methacrylate reactive resin. It is formulated to form a very strong cohesive bond to substrates and seal surfaces
Uses
SILCOR® PMMA Concrete Sealer is used to seal and prime concrete substrates to provide a prepared surface for SILCOR® PMMA HG liquid membrane.
Product Advantages
- Excellent bond to substrate, typically stronger than the cohesive strength of concrete surface
- Low viscosity enables good penetration into cracks and voids without excessive material consumption
- Fast cure, typically 20 minutes for foot traffic and 40 minutes for overcoating
- Working temperature range can be extended by simple site addition of Cold Temperature Additive as required
- Easy to apply to horizontal and vertical surfaces
- No critical overcoating window - can be overcoated any time without re-priming, or abrading
- Seamless and monolithic
- Used over a wide temperature range, including below freezing. Note: when used for crack penetration, the product’s higher viscosity at low temperatures may reduce its penetration into cracks
System Components
- SILCOR® PMMA Concrete Sealer
- SILCOR® PMMA Powder Cat
Installation
Surface Preparation
Conduct surface preparation to ASTM D4259-22 as a recommended guide to surface preparation. The substrate must be dry and free from oil, grease, dirt, bituminous material and other contaminants. Unsound concrete and laitance shall be removed by appropriate mechanical means. Cracks to be sealed must be cleaned of debris and moisture by vacuum or compressed air.
Bond Test
Conduct tensile adhesion tests to ASTM D7234 as a recommended guide to check tensile adhesion on concrete and to ASTM D4541 on steel. The bond of the primer to the substrate should exceed the tensile strength of the substrate. In the case of concrete, this should result in concrete and fractured aggregate remaining attached to the test dolly, with failure occurring at 290 psi (2 MPa) or higher. Failure mode shall be within the concrete substrate. If low values are obtained and only a trace of substrate is attached, further preparation is required.
Application
1. Surface Priming & Sealing
SILCOR® PMMA Concrete Sealer can be applied by brush, roller or spray. The appropriate amount of SILCOR® PMMA Powder Cat is determined by the GCP Mixing Guide and is a function of the material and substrate temperature. The PMMA Powder Cat is added to the resin and thoroughly dispersed using an agitator.
2. Crack Sealing
When SILCOR PMMA Concrete Sealer used as a crack sealer, should be applied direct to the cracks via suitable dispensers as recommended by our Technical Services Department. The material is introduced directly to the crack aperture and allowed to pond, enabling the resin to penetrate the crack. Spray application for this purpose is not recomended.
Packaging and Storage
PMMA Concrete Sealer 20kg pail
Store in a cool, dry place, out of direct sunlight. Do not store near open flame or food. Product has a minimum shelf life of twelve months in the original unopened container at storage temperature not exceeding 77°F.
Coverage
For application as a full surface sealer prior to application of a GCP resin system or for consolidating a surface, SILCOR® PMMA Concrete Sealer is applied in one coat at a rate of 80-175 ft2 per gallon (96 sft to 210 sft per pail of 1.2 gal), depending on the porosity of the concrete. Porous substrates may require a second application.
Consumption rates for sealing cracks can vary considerably, and a test area should be installed before commencing work to help determine likely coverage rates.
Cleaning
All tools and equipment should be cleaned with acetone before the material is allowed to cure.
Precautions
SILCOR® PMMA Concrete Sealer liquid resin components are classed as flammable liquid (flashpoint 52.7°F) and should be handled accordingly. Workers should wear protective clothing. Adequate ventilation must be provided. Read and understand all Material Safety Data Sheets prior to commencing work. Immediately install entire contents of the pail after mixing, do not exceed recommended pot life of the material.
The resin cannot be thinned with the additions of any solvents.
Health & Safety
Users must read and understand the product label and Safety Data Sheet for each system component before use. All users should acquaint themselves with this information prior to working with the material. Carefully read detailed precaution statements on the product labels and SDS before use. SDS’s can be obtained from the GCP website at gcpat.com or by contacting GCP toll free at 1-866-333-3SBM(3726)
Physical Properties
| Solid % | 100% |
| Pot Life @ 68°F | 10-20 minutes |
| Cure Rate @ 68°F | 30-45 minutes |
| Tensile Strength | 4,000 psi |
| Tensile Modulus | 400,000 psi |
| Viscosity | 50-80cps |
| Elongation | 25-30% |
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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.
HYDRODUCT and PREPRUFE are 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.
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GCP Applied Technologies Inc., 2325 Lakeview Parkway, Suite 400, Alpharetta, GA 30009, USA
GCP Canada, Inc., 294 Clements Road, West, Ajax, Ontario, Canada L1S 3C6
This document is only current as of the last updated date stated below and is valid only for use in the United States. 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 www.gcpat.com. 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: 2025-08-15
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