For the resin casts (in order to maximise mould life) I give the mould a light spray before casting with . It's a little more expensive than other releases I've used but I feel it gives best results and is the least noxious product.
For silicone to silicone release (for making multipart moulds) I always preferred to scoop some Vaseline into a metal spoon and use a lighter underneath to liquify it. I then brush the liquid Vaseline onto the silicone. If you already have a liquid Vaseline I would try just brushing it straight on rather than spraying it on, as that way you can avoid getting it on the master model.