Rubber gasket to deflect water on slide out

Has anyone tried a small rubber tape sticky on one side, comes in roll to put at 45degree angle to deflect water on slide. It is grooved so it will catch water and run to outside. I just saw this on a coach at the escapees rally in Gillette, wyo. owner told me he had a leak at bottom of bedroom slide out during rain. He put the above at the 45 top and bottom, both side of slide. Told me no more leaks.. If anyone has seen or tried, please comment. Thanks.

Jim