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as above. do you need to put a backing coat on then throw the chips on, or can they be thown onto the scratch coat as they have been mixed in the muck? thanx

I'll cut a long story boring, the back of my garage had to be rebuilt and as the rest of the garage was pebbledashed using Powerwall i now need to match the back with the sides. Do i need to scratch and leave till it sets before puting on the 'exposed' and chip, or could i hit the same day...