in the brilliant youtube adam savage clip looking at aardman's techniques for "early man", they talk about injecting silicone.
is this much better than spooning it into the two halves, putting the halves together, and then topping up with more silicone? does it decrease the amount of seams and air bubbles, etc?
does anyone have any tips about things to do/not do when using this sort of thing? will any syringe of a decent size do the job?
see 9m45s here:
Hi David. I have injected silicone into moulds, although mostly I do the overfill method. The injection method requires the armature to be fixed in place and needs air escape holes. I used large 50ml syringes with wide nozzles (from Mole Valley Farmers), and used retarder for platinum silicone to be sure that the mould would be filled before the rubber started to set. It will give a more bubble-free result, but the disadvantage is that you can't see what's going on inside, so this method requires very good quality moulds.