These are two methods of retreading. The mold-cure process renews a casing from bead to bead. Unvulcanised rubber is applied to the buffed tyre and it is placed in a mould, exactly as it would be in the manufacture of new tyres. So the retread tyre looks exactly like a new tyre: only the naming on the sidewalls will indicate that the tire has been retreaded.
The pre-cure process (also known as ‘cold-cure’) involves applying a new pre-moulded, pre-vulcanised tread to the casing. It is bonded to the casing by means of a thin layer of specially compounded uncured rubber (known as cushion or bonding gum) which, when vulcanized, acts as an adhesive.