long ago i read online somewhere that you can thin it with lighter fluid, at the time i wanted it pourably thin, so i used a lot of lighter fluid... it really made me nervous using so much flamable liquid so i tried other things to mix it with, and found that mineral spirits also seems to thin it out, but for some reason at the time that i was doing that i didn't like the end result with the mineral spirits... now i can't remember why i didn't like it, but i'll probably be trying it again here in a few days just to try and re-figure that out.
i really like the idea of making things out of rubber, when i was doing it years ago i was using a very expensive mold rubber that i had left over from a friend at college and i wasn't really making much of anything interesting, just experimenting with what may or may not stick to the mold and what may or may not color silicone caulk, now that i've started making again... i want to try stuff that i never got around to figuring out, like for instance i was only in the experimental stage with making a rubber top.
this time i might actually go with trying to make a mold to make a rubber top, years ago when i tried i was just stretching some balloons over funnels (actually i think that could still work, the funnels are the shape you want, the balloons are just there because you don't want the silicone to stick permanently to your funnels, the latex of the balloon sticks to it but if you're careful you can peel it off very slowly, if you're less than careful you can just rely on the fact that petroleum products eat latex)... one thought i have is to make a rubber mold of "The Love" from s8's crown area then make a throwaway positive to mold directly around then put that directly into a form that would make it part of a mold/funel-with-baloons thing...
or maybe i'll give up on the silicone top idea and just make rubber copies of my godzilla action figures... it'd give them a feel like those pro-wrestler rubber figures the kids i was jealous of had in the eighties.