Spray Rails for 18'

[rayhawk]

Has anybody installed spray rails on their 18' SC? This boat is very wet, water comes right up and over the sides. What type did you use and how effective were they? I have seen the glue on type,(smart rail) and the one from taco. How would I fasten the screw on type since I can't get to the inside? Where do these get mounted (how far back). Any experience would be appreciated. Thanks.