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Good going. Realy nice work
Got some good tutorials on you tube, for this sort of thing. Thinking of trying it myself.

Is there any silicon that can be used for hot plastic, instead of resin?

Aerethan wrote:define "hot"

Just above melting point I.E liquid

Our two-part liquid RTV (Room Temperature Vulcanizing...cures without heat) silicone mold rubber is ideal for making duplicate parts with our casting resins. To make a mold, mix parts A and B together and pour into a mold box containing your pattern. After curing, the mold is soft and pliable and reproduces every detail of your pattern. And, because it is genuine silicone rubber (withstands up to 600 degrees F), you can use these molds to cast small metal parts with our low-temperature alloys. Instructions for making molds are included.

Aerethan wrote:As a rule I only ever make one mold at a time. This allows me to take my time and make sure that it is done right.

As for the mold warping when injecting resin, you should be using piece of heavy cardboard or mdf with rubber bands around the mold for that exact reason. Also make sure that you put keys in the mold so that it lines up properly every time.

I'm not familiar with pinksyl, but most companies offer silicone rubber with different working and curing times. The faster the cure time, the less working time.

Aerethan is right.The slower you go, the better/faster it'll be.
Just make sure your using the right silicone.