If not bottom paint, what?
Two Part Polyurethane coatings such as Interlux Interthane Plus are not designed for under water applications. I imagine that Awlgrip and Emron would be no different.
The paint will fail if left in the water long enough. You can contact Interlux using the contact numbers on www.yachtpaint.com to conform the best solution using their products. I am sure other manufacturers such as US Paint will also have contact numbers so that you can ask about Awlgrip, etc...