If you’ve ever used silicone caulking, you can use the same technique for tidy results:
First, level it all off with a card to get rid of the excess. Then go back over with something rigid and rounded off… I like using a guitar pick. This slightly recesses it (well, except RIGHT at the edges, but let’s not be pedantic). Then if it STILL looks bumpy… lick your broadest finger (yup, I’m serious) and oh so gently run it around. If you’re not careful you will recess the silicone too much and you have to start over.
But if you’re careful, you get a perfectly smooth surface.
On the other hand, I’ve had “bumpy” RTV’d yoyos that responded just fine. It ultimately doesn’t really matter much as long as the bumps don’t cause the silicone to start ripping out.