Yep. That's right. I am about to change your mold-making technique forever. This simple way of silicone mold-making will have you wanting to make casts of all your trinkets and toys. You will need: water blue dish-soap (any brand seems to work) 100% Silicone (do not buy quick set silicone, you need 100% silicone) bowl caulking gun something you want to make a mold of. scissors/knife masking tape - to patch holes in your positive, if necessary.