The mould lasts longer if you use wax without stearin added. Coat the inside of the mould with mould release ( Re-coat the mould every 5 or so pourings). Pour in the wax in the usual way.Top up in usual way. Remove from mould when still very slightly warm by peeling back on itself having first greased the outside of the mould with washing up liquid. To get a two tone effect you can pour in a lighter colour first (white looks really good) , leave until there it has just set about 1/8" on the inside, then pour out the molten wax. Then fill again using a darker colour.