Jahn M60

Interior Plaster & Exterior Stucco

These single-component, cementitious plasters are engineered for use on new or existing brick or stone substrates. Jahn M60 can be altered to adhere to block or concrete (Contact Cathedral Stone for more details). Jahn M60 may be applied as a ground coat or finished system in thickness ranging from 1/4" to 1 1/2". The Jahn System eliminates the need for the traditional three-part application process (brown, scratch, finish). M60 is available in both interior and exterior formulations with factory custom coloring available. The plaster exhibits a superior chemical bond to prepared substrates, without the addition of latex or acrylic bonding agents or additives, and performs in situations where previous methods and materials have failed due to repeated water and salt saturation. M60 is water based, thus environmentally and user safe with no solvent clean up or disposal problems

Features And Benefits

*Single-Component: Mixes with water only, improving quality control and consistency of application.
*Compatible Formulations: Compatibility of physical properties ensures that the plaster and substrate react to the environment in the same way.
*Contains No Latex or Acrylic Bonding Agents: It protects the substrate by allowing salts, water vapor, and liquid water to reach the surface, preventing failure due to salt expansion or freeze/thaw cycles.
*Tenacious Adhesion: Strong bonding capabilities without relying on synthetic bonding agents.
*Water Based: Environmentally and user safe. No solvent clean-up or disposal problems.
*Custom Colored Upon Request: Closely matches existing masonry. Excellent for repairs or as a complete coverage system. Choose from Standard or Custom Colors.

Surface Preparation
Surfaces to receive M60 must be sound and free of all dust, dirt, grease, laitance and/or any other coating or foreign substance which may prevent proper adhesion. Remove all loose or friable mortar before application of Jahn M60. The sides of the repair area should be "square cut" with edges and a minimum of 1/4" depth. Wash the prepared surface with clean water and a bristle brush. All necessary joint repairs should be completed with Jahn M110 Pointing Mortar 21 days prior to the application of Jahn M60.

Mixing
The mixing ratio is approximately 4 parts powder to 1 part water by volume, depending on temperature and humidity. (This ratio can be altered as needed to suit local conditions.) Small quantities may be mixed manually, stirring until the plaster is thoroughly mixed. Large quantities should be mixed for a minimum of five minutes using a slow speed drill (400 - 600 rpm) equipped with a Jiffler-type mixing paddle. The more thoroughly mixed the material becomes, the easier it is to apply and the better the quality of the finished product. The working time will vary, depending upon wind, temperature, and humidity. Using excessive water in the mixture may affect the color of the repair.

Bulk mixing may be done in a mortar mixer, paying strict attention to proper quantities of water and material used.

Application
Moisten the substrate using clean water. (The substrate requires intensive presoaking prior to application of Jahn M60.) Thoroughly presoak until saturated (Saturated Surface Dry or SSD). This prevents the stucco from drying too quickly. If the surface is allowed to dry out before applying M60, this step must be repeated. This is critical. It is our recommendation that only experienced stucco or plastering contractors, or trained Jahn Stucco applicators use this material. Without knowledge of sufficient substrate saturation, the substrate might draw the moisture out of the Jahn M60 too quickly, and bond will not be achieved.

The material can be applied in one application or successive lifts if desired. If applying Jahn M60 in lifts, additional surface preparation is required to maintain adhesion between lifts. Scratch or brush the surface of the initial coat to remove the cement skin formed during troweling. This will open the pores before an additional layer of material is applied. Then scratch again with a plasterer's comb to create more surface area for mechanical bonding. Apply the second coat 48 to 72 hours later, making sure the surface is properly presoaked. The waiting period before finishing will vary, depending on wind, temperature and humidity.

After initial set up, while the plaster is still workable, wipe the surface with a dry sponge in order to prevent surface map cracking of the material. Never use a damp sponge for final finishing.

Curing
Periodically mist M60 repairs with clean water for at least a 72-hour period. The timing for initial misting will vary with ambient conditions. Hot, dry conditions may require misting in 30 to 60 minutes. Cooler, damp conditions may require waiting several hours before beginning the curing process. Mist several times a day. Should access to the repairs be impossible over a period of time, plastic may be used to cover them temporarily. The application of plastic, however, does not remove the need for normal curing techniques

Clean Up
Remove uncured material from the perimeter of the repair before it dries using clean water and a rubber sponge. Repeat several times with clean water to prevent a halo effect (staining of adjacent masonry). Cured plaster may only be removed chemically or mechanically.

Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.

Clean Up
While injecting, continually check for grout runs and spills on the surface of the masonry, and clean the surface before the grout has time to set. This is normally done with a clean sponge and water, and may have to be done several times, rinsing the sponge repeatedly with clean water. Remove uncured mortar from tools and equipment with water as soon as possible. Cured grout many only be removed chemically or mechanically.

Safety Requirements
It is recommended that safety goggles, gloves, and a dust mask equipped with P-2 filters (or equivalent) be worn for protection while mixing.

Limitations
* Do not apply Jahn M60 to a frozen or exceedingly hot substrate. The applied M60 must be protected from extreme heat, freezing, excessive wind, direct sunlight, and rain. Ambient temperature range should be 40° F to 90° F with low to average humidity.
* Do not add bonding agents to Jahn M60 or use them as surface preparation materials.
* Minimum thickness of M60 application is 1/4".

Packaging and Coverage
A 5 gallon plastic pail contains approximately 33 lb. of material. This will cover 0.5 cubic feet (12 sq. feet at 1/2" thickness).

Storage And Shelf Life
Store material in a dry area away from direct sunlight. Ambient storage conditions should be in the range of 40° F to 90° F with low to average humidity. Average shelf life is six months in original, unopened packaging.

Technical Data
Jahn M60

Warning
Not for internal consumption. Keep out of reach of children and animals.

Product data last updated 2/2004