We purchased a self adhesive freeze from a company in UK with great results. It can be ordered in quite a few designs - we chose a mosaic effect to hide any stains that may occur. It is 9 inches deep and comes in various packs and additional 2 foot lengths. We installed it before the beginning of this season and are delighted with the results. Although our guests are still using sun tan lotion and staining the freeze, it is not noticeable because of the mosaic design. It cost under £200 to do a 10 X 5 metre pool and was relatively easy to do . Only draw back, they do not deliver to France. PM us for details. We have no association with this company but are gite owners with the same problem as many others.