Color Matched Cement Plasters, Stucco for Masonry Restoration

CEM-PLAST 54 is a series of pre-colored, prepackaged cement plasters for use in new construction and restoration. They are formulated in accordance with ASTM C 926 specifications to provide consistent, reliable results in both performance and appearance.

CEM-PLAST 54 is a complete system, including surface bond-dash coat, base coat and finish coat materials. Components are mixed with water or Edison Restoration Latex RL-1 as directed, and are applied using the Standard Procedures for cement plaster application.

Selection:

ASTM C 926 provides selection guides and mix proportioning for various base coat and finish coat plasters. These may be based on lime with Portland cement, masonry cement or plastic cement with suitable aggregates. A variety of admixtures, textures and other options are also permitted. As a custom manufactured system, CEM-PLAST 54 and its components can be formulated and manufactured to meet the specific requirements of any particular design specification within the ASTM C 926 guidelines.

For general purpose repair and plastering work, Edison Coatings also offers several basic "standard" mixes and recommendations:

CEM-PLAST 54 BASE M

This non-pigmented plaster base mix is intended for application over porous substrates such as common brick and concrete block. It is mixed with water for general purpose plaster work, or may be mixed with Restoration Latex RL- 1 for improved bond, reduced shrinkage and lower Modulus of Elasticity. Latex-modified plasters also eliminate wet-curing requirements under most conditions, and may be applied in greater depths without risk of cracking.

CEM-PLAST 54 BASE CM

This non-pigmented plaster base mix is intended for application over low porosity substrates such as dense, smooth brick and clay tile. It is mixed with water for general purpose plaster work, or may be mixed with Restoration Latex RL-1 for improved bond, reduced shrinkage and lower Modulus of Elasticity.

CEM-PLAST 54 FINISH FM

This general purpose finish is available in a wide range of custom colors and finishes, and may also incorporate custom aggregates for size and color distinction. It is generally mixed with water for closest match to historic plasters, but may also be formulated for use with RL-1 latex upon request. A standard fine white formula is also offered.

RL-2 BASED BOND COAT

While special purpose bond coats are available, a simple and effective method of bond coating is to mix CEM-PLAST 54 BASE M or CM with RL-2 RESTORATION LATEX This produces a slurry consistency which can then be sprayed or brushed and worked into the surface to provide superior bonding.

REPAIRS: THE CUSTOM 45 ALTERNATIVE

For limited repairs, such as to cracks or localized damages in existing plasters, Custom SYSTEM 45 Stucco formula provides a viable alternative, which may be applied in a single application.

APPLICATION:

1. Observe all standard practices for cement plaster application and restoration.

2. Surface Preparation: Stone, masonry or concrete substrates must be clean and free of oils, dirt, coatings, unsound plaster or foreign materials which may inhibit bonding. Smooth, dense or non-absorbent surfaces may require abrasive blasting or acid etching prior to plaster application.

3. Priming: Dampen all porous surfaces with clean potable water prior to application, but leave no standing excess water. Do not dampen smooth, non-porous surfaces such as dense concrete or smooth brick. Prepare a bonding coat (slurry coat) consisting of CEM-PLAST 54 BASE and Restoration LatexRL-2 or RL-1, mixed to the consistency of a heavy paint (approximate mix proportions are 1 part liquid to 3 parts BASE). Spray or brush the bond coat onto the substrate and work into all depressions, pores, corners and sidewalls using a stiff brush. Keep this application thin. Apply only to as much area as will be base coated within 1 hour.

4. Mixing: All plaster mixes must be prepared in a mechanical mixer, such as a mortar mixer or in a mixing container with a slow speed drill mixer (250 - 450 rpm). Hand mixing is unacceptable. Mix for a minimum of 4 minutes, and until all material is uniform in appearance and working consistency. Base Coat mixes made with water which have stiffened because of evaporation of water may be retempered once only to restore the required consistency, but must be discarded after 1½ hours. Finish Coat mixes and latex-modified base mixes must not be retempered.

5. Base Coat Application: Apply base coat by hand or machine to the design thickness. Separation must be provided where plaster abuts dissimilar construction materials or openings. Apply each coat to an entire wall without interruption to avoid cold joints and abrupt changes in the uniformity of appearance. When applying plaster in sections, always work to an inconspicuous "break", such as a corner, opening, control joint or belt course. Base coats should be applied in such a manner as required to provide a straight and level surface, filling in any unevenness in the substrate. As soon as the base coat material becomes firm, it should be scored or shaved in one direction only, in preparation for a second base coat where required. Vertical surfaces should be scored horizontally. Second base coats should be floated uniformly as required to provide a surface receptive to the application of the finish coat. Subsequent coats may be applied once the Base Coat has set and developed sufficient rigidity to resist cracking or other physical damage when the next coat is applied.

6. Finish Coat Application: Base Coat must be allowed to set before Finish Coat application. Base Coats which have become dry should be evenly dampened with clean water to provide uniform suction. There should be no visible water on the surface when plaster is applied. Finish Coat should be applied using sufficient pressure to ensure tight contact with Base Coat.

The use of excessive amounts of water must be avoided in Finish Coat work. Finishing techniques and tools vary widely and have a pronounced effect on final appearance. Always prepare a minimum 10 sq. ft. "mock-up" prior to large scale application, to determine the tools and techniques which will produce consistent satisfactory finishes.

7. Curing: While latex-modified plasters generally require no special curing under moderate conditions, water mixes and hot dry weather may require moist curing. Moist curing is generally accomplished by applying a fine fog spray of water as frequently as necessary, usually once in the morning and once in the evening. This may be unsuitable, however, for finish Coat applications which may be eroded or discolored by water fog. Plastic film, securely taped at the perimeter can provide a barrier to moisture evaporation, and this must be timed properly to avoid surface disruption of plasters which are still soft, but not waiting too long so that excessive moisture has been lost. Liquid-applied, commercially available Moisture Evaporation Retarders can also be effective, and should be tested for effects on strength and performance.

SAFETY & HANDLING:

Read and observe the safety guidelines as detailed in the Material Safety Data Sheets supplied with this product. Contains cement and lime. Avoid skin and eye contact. May contain free silica. Use NIOSH approved silica dust masks when handling dry components.

FOR COMMERCIAL & INDUSTRIAL USE ONLY.

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Phone: (860) 747-2220 or (800) 341-6621

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	EDISON COATINGS PRODUCTS ARE FOR COMMERCIAL & INDUSTRIAL USE ONLY

Last Updated:

Tuesday, May 06, 2008



	Society for the Preservation of Historic Cements, Inc.

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Edison Coatings, Inc. makes no warranties, express or implied, as to the accuracy or completeness of any of the information contained herein. This publication is offered on a complimentary basis as a service to potential customers or specifiers. While every effort has been made to include complete and accurate information, based on data and information believed to be reliable, it is the sole responsibility of the user to determine its suitability for his own intended use and purposes. Nothing contained herein shall be construed as a warranty or guarantee of any product, process or any other recommendation stated herein. Edison Coatings, Inc. assumes no responsibility for advice given, results obtained, or for any damages whether incidental or consequential, which may be incurred as a direct or indirect result of the use of this information. By proceeding to use this information, user acknowledges and agrees that he is doing so at his own risk, and user indemnifies and holds Edison Coatings harmless against any liabilities, costs or expenses resulting therefrom. All product sales are further governed by the Edison Coatings, Inc. CONDITIONS OF SALE.