As Greg mentioned its a science. Make when you paint your rocket to to have plenty of paint on it. Usually 2-3 light coats followed by 3 medium coats and one final wet coat. You also need several coats of clear but lighter coats to build up the finish. Depending on the finish and imperfection you can start with 800 wet dry and work your way down to 2000. Usually 800, 1000, 1500 and 2000 will get you a silky smooth dull finish. From there you use a medium compound from Meguiars and rub it out the direction aka length of rocket and follow by a finer polish then wax. Also when you wet sand go the length of your rocket and do NOT sand in a circular motion. You will never get the scratches out.