we have just laid the stonemarket nautical star which seems to be some sort of slate/sanstone surrounded by 40 Sqm of raj green indian slate paving which also seems to me to be some sort of sandstone . when this is dry it looks ok however when it is wet it show all the colours and veins running through the paving which is far more interesting than when dry, the customer would like to apply something to it that will give it the wet look permanatlely, can u suggest anything plz many thx.