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In this video u can see preparation of material for filling molds.
There are several vays to prepare a material by using various components. U can actually use A LOT of different materials!!! My favourite component is a ceramic glue with some color added. To stay close to the original brick u can add caolin in powder...
Molds are filled with material and then shaked up and down to avoid air bubbles that can stay trapped under material. For 100% no bubbles u need a shaking robot lol like vibrating tool (table) but at home ... this is it... When filled, material needs to harden so that U can pull out bricks without damaging it... Time needed for hardening depend on what kind of material is used, for example if u use wall ties glue it's about 12 hours...