Thanks guys for your thoughts. From the info I gathered, you can seal the tubes on the inside. Inflate and go. But if you want to restore your inflatable to make it like new, you patch all known holes, clean the outer skin, brush or roll on this sealer they have, wait one day, paint with a special paint for inflatables. The paint makes it look as new and the sealer is supposed to seal the tiny holes.
So I am wondering if I seal the inside, which I think would be the better choice, and I still want to paint it, do I have to seal the outside too? Maybe it makes the paint stick better. ???