You are leaving out an important step. Apply the 601 bonding agent before you apply the 501. This application will last a full year. Every other car wash I enhance it with their spray Aquawax. And yes, I apply it with a straight back and forth motion. It eliminates swirl marks. Also, this stuff works better applied by hand. No need for a buffer. You don't wipe off the 601. You apply it and leave it on. You apply the 501 over the top of it. Wipe off the residue when it dries and prepare to be amazed. I use this stuff on 2 trucks, 3 cars, and 2 boats. Iv'e been using this stuff for 15 years. Better than anything I have ever tried. Order it from the Duragloss website. Good prices, fresh product, and a flat $5.00 shipping rate for any amount you order delivered anywhere in the U.S. Hope this answers your questions.