The buyer acknowledges that they are purchasing the jet ski in “as-is” condition and any repairs or defects found after the date of sale will not be the liability of the seller. The seller may request a deposit be made on the watercraft and pending approval will the sale proceed. Usually, the buyer will ask to have the jet ski inspected by a certified technician. A jet ski bill of sale is a legal document that outlines the purchase and sale of a jet sky between two (2) parties.