Cowboys in every trade.
I watched a bloke pebble dash a house near me,was a right mess,and after a year it's was thread bear(pebbles fell out,won't be right mix,no lime in it for starters) and the front had fallen off back to block work.
What did the house owner do,get him back to re render it ( and paid him) this time I watched him put It on and just rub it over with a sponge,then the house owner come out within a day of the 'plasterer'finishing it and painted it,it looks a right balls ,paint will be peeling off soon.
The bloody house owner is just as bad as the dodgy tradesman IMO,I priced that job but didn't get it cos I was to expensive .