I have now used the product twice. On both render and bare stone. The product has exceeded both mine and my customers expectations. I read many of the reviews and followed the instructions carefully. My results were achieved using the highest recommended concentration. The same results may be achieved at lower levels but that I have yet to test. The image results were achieved within a couple of hour max but often less. I have also tested it on Purbeck stone, and patio slabs with as equally impressive results
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