Plaster
The cement-sand coat troweled onto brick or block to form the base of a wall finish. If it is hollow, cracked or still damp, nothing applied above it - putty, primer or paint - will hold.
The cement-sand coat troweled onto brick or block to form the base of a wall finish. If it is hollow, cracked or still damp, nothing applied above it - putty, primer or paint - will hold.