Sealing around the screws would only work if the screws were on the outside of your window frame. You say it's soaking the wall frame around the bottom of your window, that would be an indication that your drain holes in the window channel were plugged on the outside, allowing water to accumulate in the channel. Try cleaning out the channels and drain holes and see if that doesn't fix it.
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Jon & Chris Everton
1986 40' Dog House #86
0 hp 8V92 Allison HT740
Soon to be 500hp ISM with ZF 6 Speed
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