My boat neighbor had a little tension the other day when a new boater missjudged his anchors capability in a rising tide and blowing wind.

Another thing you can do about surface tension....
One thing you can do which will improve the hull speed, is to roll the paint on and have a helper go with a paintbrush along with you, brushing out the surface roller texture, to smooth and remove all the minute little craters, air bubbles and uneven valleys and surface thickness variables that are inherent with using a roller. A paintbrush will take out the pits and eliminate all the little peaks and valleys that allow for the roots of marine growth to get started into the paint surface. Just rolling the paint on will be maybe ok… but you sacrifice hull speed, and subsequent cleanings will be more difficult.
You have to have your helper brush over the rolled paint as it is rolled on to get a flatter paint job. Enjoy a marked difference in your hull speed and cleaning!
Two coats are preferred, for cleaning maintenance over time. Hard bottom paint has a more extended life than softer types. The wear and antifouling characteristics are much better with hard bottom paint.

For those who like to have the racing edge with an even faster hull (and its easy to apply) check this out.
Developed for the Navy to improve torpedo performance is a product called Sea Slide.
http://www.chemical-supermarket.com/Sea-Slide-Hydrophillic-Coating-p621.html
Using a small foam roller it is easy to apply over the new bottom paint and the bottom paint can breath/leach through its porous surface.