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Will a business seller be liable to a consumer for failure to provide adequate installation instructions?

I act for a business who sell windows to the general public. One such window was sold to an individual who installed the window himself. He used an incorrect sealant which damaged the double-glazing seal and, accordingly, has rendered the window useless. He chose to buy and install the window himself - my client was not engaged to install it. The contract is governed by the Sales of Goods Act 1979. Will a business seller be liable to a consumer for breach of contract caused by something outside of the seller's knowledge? In this instance, the seller did not know that a particular sealant would not work. Should the seller have provided installation instructions?

Anonymous (private practice)

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