I haven't used the 4630 but I am assuming it has a low melt point. I keep my was slabs in a rubbermaid tub as mentioned already but I don't care if it slumps. I use a cheese cutter, piano wire connected to wood handles, to cut my slabs when ready for use. Works great for me. I pour in my garage most of the year. Small test batches I may do in my house.