Raimondo, just a suggestion, I noticed that there are some air bubbles. So if you aren't using a pressure pot I suggest using one, and it'll help get rid of the air bubbles. If you are using a pressure pot then if you see an air bubble in about the same spot on the cast each time you'll want to either take a pin, or a toothpick, or some other sharp object, and pierce the mold in that area to allow the air bubbles to escape from where they seem to get trapped more often.
Thank you very much for advise and tips
It' s always a little treasure
I have to confess that I didn't use the pressury pot just beacuse I don' t own one of it. Even the stuff I use as silicone is too expensive for my plans.
I noted that us casters use cheaper silicone for their work and I think it' s another good thing. I have no resources, I have no money (3 years still unemployed, damned Italy) and all stuff I own is coming from trading: my committents give me loose figures, fodders or siliconic rubber for my paintworks on custom figures or complete custom figures. Just for example, one italian pal of mine, gave me 5 liters of siliconic rubber (prochima gls-50) plus various figures and accessories in trading for 4 custom action figures (still workin' on this figures).
That italian chimical siliconic-rubber costs too much (55 euro for 1 lt. !!!!!!) and I won't create in future anymore molds... if I don't find a cheaper solution to cast my little holsters, body-armour, weapons, headsculpts, etc.