Light sanding is recommended. A clean cloth moistened with Isopropyl alcohol or plain water may be used to clean surfaces. Mix, mix, mix, and mix some more. During coating, the temperature falls below dewpoint. A little temperature goes a long way toward good coating.
Weak bond is a result of too much clamp pressure.
The key to strong epoxy bonds is light pressure and adding the correct filler. Depending on your application technique, generally, you can cover 500 sq. 3 mil thick. And the thin film set will decrease by a factor of approximately 0.7 . We have found that the thinner the laminate or the film, the less affected is the thin film set time.