concrete lamp

Step 6 Break the mold

Time to break the mold. Take off the base, but leave the sides attached. It's tempting to look, but it'll be easier and safer to ream out the middle if you leave the sides attached. If you used solid foam, get a big, fat, long drill bit and ream it out as much as possible Stick screwdrivers in there, putty knives, whatever you need to do to get that foam out. Foamcore is the same deal. Needlenose plyers and yanking might help.

This step is a pain in the ass. Take your time and be gentle. It's possible to break this thing.

After you get the center pretty well cleaned out, you can take the outer mold off. Make sure it didn't crack anywhere (if it did, you can fix cracks with superglue). You might need to excavate a bit the glass edges so they are exposed. Be gentle. you can use a flat edge screwdriver to do this. You might also need to do this on the inside, if some of the rockite got in between the formwork and the glass. It should chip off. Be gentle.

Finally you can sand lightly the sharp corners, and rinse the whole thing off in the sink. Make sure all the glass is exposed cleanly inside and out.

If it came out first try, nice work. If not, hopefully you can re-use the glass and re-pour.