bunk window leak

[slowpoke]

spring time bunk window was leaking steady stream from top of window pouring into interior. dealer said very expensive to fix. went to home depo bought 1/2 inch round grey window foam (foam window backer rod) used a small bout 3/4 inch plastic putty knife slowly worked it into gap kind of roll it in just behind glass. it stopped the leak been 5 months now, I noticed that if I need to I could push it in farther and seal interior seal as well. window still opens fine, cause I forgot about it and been using that window. winter I may not try to open, it may freeze.