Teaching you to make your own silicone mold step by step

Step one:  Preparing the material

   500g of liquid silicone rubber & 10g of catalyst

  Strap clamp

  Wood ‘Master block ‘this will define the size of your casting blank

  Wood frame

  Glad wrap / food plastic film

  Wood or corian board here I use an off cut of 3m/m MDF

  1 Potato

Step two:

  Cut all your wood to size for the frame here I’m doing a 1” mould by 5 1/4”x 5 1/2” ( size of the master block ) I will       have then 5 blanks 1” x 5 ¼” . The wood frame is 2 length 6 ¼” x ¾” thick x 1 ½”high and 2 length 8 ½” x ¾” thick x 1 ½”high,     Wrap all your wood pieces including the 3 m/m MDF base with glad wrap then make your frame.

Step Three:

  Secure the master block to the board with double side sticky tape

Step Four:

  Cut the RTV nozzle cartridge to a wide opening and start the edges while holding the master block, make sure that the nozzle is in the silicone to prevent air bubbles, cover the top who will be the bottom of the mould and smooth the edge with the potato ( silicone doesn’t stick to potato starch ) then cover with glad wrap to smooth the surface and let it cure 24 hours.

Step Five:

After 24 hours you can undo the frame and peel off each side of the mould, you have to go very easy as the silicone still fresh and can be tear easily 
Base removed ( nice smooth edges )

2018-06-26