Gator,
If the 30# dacron backing is hollow braided, I agree with the post about running the mono a few inches up the backing, whip finish the end of the backing, and coat with aqua flex. I also rough up the mono with sand paper to give the backing a better bite on the mono, altho it probably isn't necessary.
I just tried this the other day playing around with a reel loaded with 20# backing, and I couldn't get the backing braid to open up enough even with a needle thinner than the mono diameter, so it depends a lot on the specific backing material with respect to being hollow braided or not, and how wide it will open if it is hollow braided.
Sincerely,
Salmo g.