Snap in is popping loose

A home owner from Texas says:
July 24, 2015
I replaced the top snap in going across my windows horizontally. It appears that after a week in the Texas heat and sun, the corners pop loose. What do you recommend I use to secure the snap in's so it does not continue to pop out on each end?
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Paul from SWISCO responded:
July 27, 2015
Are you referring to our 55-006? This type of glazing is held in with pressure between the glass and frame. Sometimes the glass is cut short or slipped down behind the opposite end of the sash. If it is just the corners, try a little caulk on the corners where the snap-in meet.
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