So I need to make some really realistic breast. Saggy old lady ones specifically. I'm pretty new to what silicones to use for what. Ideally I would deaden one of these to do the breast tissue and then skin them in either the 00-20/20 or the 00-30/30. But if I can't would want the best one to just cast solid. Also can you add any deadener to these or is it just not needed? Thank you.