The thin-set helps to bond the new tiles to the appropriate substrates. It is important to remember that thin-set doesn't stick well to paints or other non porous surfaces, even if they are coated or sealed.
For concrete pools, tile is an attractive and durable choice. Tile is also simple to maintain. You can easily replace individual tiles without having to call in professionals. In general, a DIY patch up job will cost around $50 in materials and time.
Pebble-plaster concrete aggregates, like Pebble Tec or Pebble Sheen may be the most expensive option in this category but they have a distinctive look and a river rock-like texture beneathfoot. Pebble-mixtures are also among the most stain and chemical-resistant of all plaster types.