The only way to seal the screen IMHO is to remove it, clean the rubber and re seal and refit it. Treat any rust you find underneath while it's out.
I've used this stuff which so far has been 100% effective and stays flexible.
http://www.ebay.co.uk/ulk/itm/221384238072
I've used this stuff which so far has been 100% effective and stays flexible.
http://www.ebay.co.uk/ulk/itm/221384238072
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