While floating a 20µg/cm2 foil might seem daunting, the truth is the foils are very strong. Notice how it is put in at an angle with the corner touching the water, then lifted out of the water which allows it to reverse directions and flow backwards under the foil releasing quickly. Then lowered back in again, and removed to repeat the process. The foil is finally entirely released! Quick float process is just to gain familiarity with how the foil operates and to get comfortable handling it. A slower more controlled floating process is best for the ideal end result.