Purchasing a PROFoil application kit is very much advised if you are purchasing a PROFoil Interactive Touch Film. Every application requires application fluid, rather than water, for installation.
The installation squeegee is just as important, if not more important, for a high quality PROFoil installation as application fluid is. Incorrect squeegees can not only scratch and damage a PROFoil during installation, but also inferior squeegees don't allow you to apply the amount of even pressure needed to remove all of the application fluid from under the foil during your installation.
Application Fluid is your friend! A common mistake is not using enough application fluid during installation. This results in streaks or air bubbles in your foil due to dry spots, making for an improper seal.