Bed liner is a poor choice for a hull coating,OP said "inside," not hull coating.
most if not all of the people that put it on their boat regret it afterwards... and the boat gets sold with that junk on it instead of trying to remove it.That's why you use it on your decks, not on your hull and you use some thing like Grizzly Grip that designed for boats instead of "bed liner." Different chemical makeup.
Bed liner only stops leaks temporarily, another one of the reasons that the boat gets sold with the bed liner on it. Bed liner makes it very difficult to find out exactly where the boat is leaking... and you spend more time chasing leaks and removing bed liner trying to find the leak.Don't see anywhere original poster mentioned leaks or dealing with leaks.
... but don't take my word for this, go ahead and apply it to your boat and find out for yourself.
Gluvit or Coat-it to stop leaksAgain, no leaks mentioned in OP.
a couple good coats of tractor and implement paint over self etching primer is a much better option and it looks a lot nicer too. Looks are subjective and a matter of opinion. I'm using oil based enamel paint with aliphatic additive (Which is what tractor and implement paint is.) and I've seen in person what the aliphatic Grizzly Grip looks like and have a different color from what I've seen applied in my garage right now I'm about to put on. The Grizzly Grip looks as good or better than the paint and hides flaws much, much better in addition to having a much better grip to walk on. Not only that, but if it's applied PROPERLY by those using it and a two part epoxy primer is used, it adheres better than paint and does not flake off.