I've noticed that some of my fish are a little banged up at the end of the day from bouncing around in my aluminum livewell.

Is there anything that I can use to line and cushion the walls of my livewell?

I've thought about possibly using a rubberized spray-on material, but that might not be slick enough and could cause abrasions to fish that are rubbed or bounced along a "non-slip" surface. I'm also hoping that I can get something that will help to act as a bit of an insulator.

Anybody have any ideas?

First thought I had might be styrofoam when I read this. Just a thought though.

Try this: http://www.well-mate.net/

For a cheap fix get some velcro and bubble wrap. Velcro the bubble wrap to the inside of your well. You might have to experment a little sometimes making things stick to aluminum can be tough.

You could always bubble wrap the fish instead.  ;D

What about applying a 1/8" - 1/4" layer of silicone to the walls and top of the box?

When this dries would it pose any health problems to the fish?

Will bacteria grow or feed on it?

Is there a thick spray-on version similar to the kind found in caulking tubes?