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Thanks again - we needed an immediate solution so used what we could get. It sank in very easily, but is not dry yet. It was in a confined space under the stairs which had been blocked off by a piece of large furniture for about 50 years!! To compound matters the concrete floor had also deteriorated and needed to be sealed. Along with a bit of gloss painting, you can imagine the smell, and it will be a while before we can use the space for storage. It should all be worth it in the end though.