I am new to concrete but am loving it so if anyone has ever done any slip casting with concrete I would love some tips.
What you need:
ABS styrene 2.5mm
sand (fine grit)
small piece of foam core
Step 1: Cutting the mold
Tape them down to your 2.5mm ABS styrene.
Cut around each piece. You should have 5 pieces.
Step 2: Making the mold
Because these pieces have just been blown up from a tiny test model and aren't from a CAD the top is not quite flush so I pushed it in to a small piece of foam core then hot glued around the top. This should create a flat top for the lamp.
Cut or drill a small hole in this foam core for the lamp's wire to thread through.
Cut a circle plug the same size as your light fixture out of the foam core and wedge into fixture
If your fixture has holes where the concrete can enter glue them up. Wire up the light fixture on the inside and pull to the top. (although I cast the entire fixture inside the concrete on second thoughts I should have only cast half of the fixture leaving the top of the fixture exposed to stop the build up of heat within the lamp and concrete.)