SOURCE: Greenstone Holdings, Inc.

December 11, 2007 16:15 ET

Greenstone Enters $110 Billion Concrete Market With Introduction of Permeate™ HS-300 Series

NEW YORK, NY--(Marketwire - December 11, 2007) - Greenstone Holdings, Inc. (PINKSHEETS: GSHN) introduced a new series of Permeate™ as its exclusive US agent. Permeate™ HS-300 series is a concrete protection sealer developed and manufactured by D&D Corporation in Yokkaichi-City, Japan. This product, an inorganic silicate sealer is designed to protect a concrete structure from environments such as acid, other pollutants, salt, water, freeze, dirt, and degradation preventing it from cracking. Permeate HS-300 series comes in two models, HS-300 and HS-350, with HS-350 penetrating below the surface before the material hardens giving the protection without discoloration of the concrete surface. Permeate HS-300 is used to cover the surface and can also be used as paint with high color degradation resistant dye. HS-300 can also be used in combination with another product marketed by Greenstone, MagneLine Polymer Cement Mortar which adds strength to the structure. Permeate HS-300 does not require multiple coats and is a very economical method of protecting concrete from degradation and cracks. Depending on the application, the cost of application could be anywhere between 40 cents to $1 per square foot including the labor.

Sal Miwa, Chief Executive Officer of the Company, said, "The new $234 million proposed design for replacing the collapsed bridge in Minneapolis is all concrete instead of the steel like before. We believe more concrete will be used on many of 600,000 bridges in the United States and we are pleased to be able to offer Permeate HS-300 series along with MagneLine to the bridge repair and replacement market."

About Greenstone Holdings, Inc.

( Through its operating subsidiaries, Greenstone is in the business of providing a variety of unique chemical technologies that are primarily used in the building and construction industry. The Company's first brand name product, GreenShield™, offers a solution for environmental protection for wood-based building materials and others such as lumber, logs, plywood, drywall, railroad ties, fencing, and utility poles. It also offers added fire retardancy to the material it is applied to. The $25 billion water damage market is one example of many which GreenShield can find a niche in. Greenstone also distributes Green-Dri™, revolutionary biological dry kiln for drying wood, Permeate™, a very unique chemical sealer for metal, concrete, and other construction material, and MagneLine™, a very strong polymer cement mortar to reinforce metal and concrete structures such as bridges and highways.

Forward Looking Statements:

Safe Harbor statement under the Private Securities Litigation Reform Act of 1995: Except for historical information contained herein, the matters discussed in this press release are forward-looking statements that involve risks and uncertainties, including but not limited to economic, competitive, governmental and technological factors effecting the Company's operations, markets, products and prices and other factors discussed in the Company's various filings with the Securities and Exchange Commission.

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