The Demoulding

Time to demould the tile and the wall.

I made the surrounding box out of Lego, as it allows me to set a specific size fairly easily. It's blue-tacked down on a bit of clear plastic. I over did it with the blue-tack, as it's obvious from beneath, that the silicone didn't come near to it.

I didn't glue down the masters enough though. They've been retained by the silicone. Need to cut them out.
Demoulding consisted of first removing the lego, brick by brick. Most of them came. Away without and trouble, though the dividing bar needed a little cutting to free the bottom bricks.

As you can see, the leakage around the bottom doesn't look too good. I have a plan for next time though.

After cutting away the flash, came the pulling, to free the masters. As expected, they came away from the board with the moulds. This needed more cutting to free them up. Just the silicone that has flowed under the base of them.

The good news is, they came out without any real problems. Not perfect, but I always expected to have to make a second cast, with plaster or resin masters made from these, then adjusted by hand, with a file, or green stuff.

Next related post, casting time.