Prop Glop barnacle repellent applied under water/anti fouling/propeller anti-fouling material/saves gas/saves fuel/designed to be applied while the boat is still in the water/use if you are delayed for an expensive haul-out/Prop Glop by Moby Cool.com is designed to be applied to pleasure boats while still in the water/Works great on boats that are slow moving, like sailboats and trawlers/works for up to six months on boats that spend lots of time in a marina/ apply Prop Glop by Moby-Cool.com when you have to leave your boat in the marina for a long time. Works great over all marine botton paits such as copper based bottom paint,copper anti-fouling paint, copper oxide ablative paint/ablative bottom paints of all kinds/Apply by owner or diver anytime/ Good for cruisers,boats,sailboats,catamarans,yachts,motorboats,use on boats such as Chris Craft (tm), Sea ray(tm), Cruisers (tm), Hatteras (tm), Mainship (tm), and many others/ Easy to apply under water by any owner or diver/ inexpensive to buy/ lasts up to six months with one application/ applies in minutes / get 2 to 3 applications per tube for a single screw boat. Works on propellers, shafts, rudders and trim tabs. Use on the water line for a clean water line. Anti fouling for propellers, rudders, shafts, and trim tabs. Thousands of satisfied customers/On the market for five years Prop Glop by Moby -Cool.com is a proven product to fill in those haul out gaps. Good by barnacles/ So long fouling/ Strong but environmentally green. Featured in Florida mariner magazine/