It's often done in situ - you might find someone to do it for you? If it's outside that is. Adding the aggregate on top is a bit shit as it tends to fall out. Washing the cement/matrix off the top few mm is the better method but you need to get the timing right.
It's often done in situ - you might find someone to do it for you? If it's outside that is. Adding the aggregate on top is a bit shit as it tends to fall out. Washing the cement/matrix off the top few mm is the better method but you need to get the timing right.