I need to stick wood to fiber glass, permanently

[Mississippi Steve]

I have a 6ftx3ft board of sheet wood. I want to permanently glue/cement it to a plastic or fiber glass window. The weather will be above freezing. What product should I buy?

First off, I hope this *YOUR OWN HOME* and not a rental, or your parents, or a dorm.

as far as a product.. whats wrong with a couple of sheet metal screws in the frame?? lots easier and can be taken down without destroying the window.

If it *HAS to be glued... get a caulk gun and some clear RTV...make sure both surfaces are clean and dry, then run a bead around the window frame and lay the plywood in there and drive a couple of screws into the frame to hold it in place till the RTV sets up. At least that way, when you have to take it down, you will be able to peel the RTV off and not wreck the window.