the issue i had with the alumilite is the cure time, 24 hours is such a pain expecially prototyping...oomoo cures so much faster (30 is like 5 hours) and is really durable if you plan out your part undercuts. if you have a bunch of undercuts just be gentle removing the part. i can generally get 30 to 40 hard multi joint swimbaits out of a mold if im careful and take my time. also remember if you get a tear mix a little of the same silicone your mold is made of and brush a small amount on the torn pieces to "glue" them back together(if is a big enough section that was torn apart). End of the day your mold is only as good as the prep you put into it..IE venting ect.
i use the platinum cure for casting platinum cure silicone part..if you mix tin and platinum cure silicone your going to have a mess.