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Our hypothesis has been proven correct. The hypothesis that car windscreens treated with Rain-X are able to repel water.

Using water repelling solutions on car windshields will help to keep the glass clean and clear on rainy days. These products can also help to reduce fogging and misting on the windshield. They help us to drive more comfortably and safer at night and on rainy days.

Also consider

Would your results differ if the science fair project were to be repeated by fixing the angle of slant of the glass and varying the speed of the wind?

The science fair project can also be repeated using different brands of water repellent like Rain Clear.


Rain-X versus PPG Aquapel- grudge match -

Rain-X -

Rain Clear rain repellent gel kit -

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Complexity level:
Project cost ($):
Time required:
1 hour to prepare, 1 hour for the science project experiment
Material availability:
Easily found
Safety concerns:

Handle glass carefully - wear protective gloves