A kit packaged exterior grade stone repair compound. Overfill of patch area, and grinding flush. The patch area resembles limestone texture. This product exhibits far superior color stability and strength in freeze thaw conditions.

Options:

Setup time - Fast 20 min@ 70F, Grinding 45 min@ 70F
Color - Std. Buff, Custom As required
Viscosity - Std. Knife Grade

Applications

Overfill and grind patching
Filling anchor holes
Dutchman installation (Replacement of stone pieces)
Stone corner repair
Capping material for crack repair

Limitations
Use on dry stone. Use on oil, grease, and coatings free stone. Store product @ room temperature and limit humidity exposure. Do not store at or near freezing temperatures.

Technical Data

Mixed Properties	Values	Test Methods
Mix Ratio	7:1 by weight or volume (Use entire kit or mix small amount with enclosed measuring cups) QUART KIT Packaged Part A in quart container, 4 tubes part B
Mixed Viscosity at 75°F	General mortar consistency
Pot Life at 75°F	2 minutes	Std. high speed version
Set Up Time:	15 minutes @ 70F
Dry Grind:	2 hours @ 70F
90% Cure:	1-2 hours

Cured Properties	Values	Test Methods
Cohesive Tensile Strength:	354.6 psi	ASTM D-638
Cohesive Tensile Moduli:	16,436 psi	ASTM D-638
Cohesive Tensile Elongation (at break):	2.425 %	ASTM D-638
Compressive Strength:	1,437 psi	ASTM D-695
Compressive Moduli:	12,810 psi	ASTM D-695
Adhesive (on Limestone) Shear	522.6 psi	ASTM D-905

Installation

General Instructions
(CSI format specifications are available )

Surface Preparation and Use
Use gloves, wear eye protection, and avoid skin contact. When grinding cured product wear a dust mask. Substrate to be patched must be completely dry and dust free. Mix and apply the entire kit at one time. Avoid stressing the joint before complete cure of product. Mask areas which must be kept free of product. Clean uncured product from tools with toluol or xylol. (Use caution, these solvents are flammable. Ensure local ventilation.) Remove cured product mechanically.

Mixing Instructions
See back of page for graphical and written instructions for kit use. Last Patch™-Limestone has a mix ratio 7:1 by weight

Product can then be tinted (do not exceed 5% by weight powder colorant addition or stone dust.) Apply with trowel or other implement into and over the area to be repaired. Latex gloves may be used to form & mold material when curing.

Temperature Dependency
The adhesive, substrate, aggregate, and environment’s temperature will affect the working properties of the material. With all items at 700F (21.1 0C) the standard product will set up in approximately 15-20 minutes. Grinding may be performed in several hours. Full cure 48 hours

Coverage
Call Bonstone for coverage of your project.

Availability

Packaging and Storage
The Last Patch™ Limestone is available in 6 oz.kit form & quart units. Standard kits and quarts are Buff, knife grade (like mortar consistency) product. Modification of standard kits for color matching requires at least 2 weeks from time of order.

Shelf life is printed on the product label. It is generally 6 months to one year from date of packaging if kept in original, unopened containers. Shelf life of Part B is reduced substantially once container is opened. Store at room temperature (well above freezing) and at a relative humidity below 75%.

Warranty

This product’s warranty is limited to replacement of defective material and freight charges to destination only. Bonstone Materials Corporation is not responsible for consequential damages.

Maintenance

This product is designed for application in areas inaccessible to maintenance procedures. Some powerful etching compounds, especially those containing hydrofluoric acid, may degrade the material.

Technical Service

Lab Service

Spectrophotometric color matching is available.
Sample patches can be made on stone forwarded to lab.

Specification Service

Specifications on file
Development of proposed specifications for special projects.

This information is furnished without warranty, representation, inducement, or license of any kind, except that is is accurate to the best of Bonstone Material Corporation's (BMC) knowledge or obtained from sources believed by BMC to be accurate, and BMC does not assume any legal responsibility for use of reliance upon same. User must determine if the product, process, or information described is suitable to the intended application. Before using any chemical, read its label and Material Safety Data Sheet.

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