you might also add that copper sulfate is used in bottom paints to keep the slime from growing on the bottom of boats. Bottom paint on the ramp is an interesting idea....but I think the bottom paint itself might be a little slick...and applying it in a non-tidal area would certainly be tricky. <img src="http://www.catsailor.com/forums/images/graemlins/tongue.gif" alt="" />