Fiberglass Door

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we purchased a figerglass front door.  installed it last fall.  the door warps.  we did not seal the door before installing.

is this common.  researched it, and found out that all doors will warp.  it changes whenever the sun shines on it.  moving and creating gaps.  then the caps go away later in the day. 

can i seal it this summer and will that prevent it from doing this?

thank you,