Hi Larry,

The 2 U-shaped channels are supposed to be drains for rain running off the port when it is mounted vertically.  They don’t work as well when the port is mounted on an angle, such as the 2 front ports on the cabin roof.

Where are your ports leaking?  Around the opening gasket?  Or, around the base of the port?  Leaks around the opening gasket will require new gaskets.  Leaks around the base will be solved with your proposed fix with one caveat.  You must get and keep the bead of sealant under the flange under compression from the screws.  If the screws are too loose to tighten; then, that must be corrected if the fix is to have any chance of success.

Roger Pihlaja
S/V Dynamic Equilibrium
1978.   Sanford, MI

Sent from my iPhone

> On Jun 4, 2026, at 3:42 PM, Larry W <62himis at gmail.com> wrote:
>
> Hi Sailors,
>
> I was getting water into the cabin while Serenity was on the trailer in my
> driveway . Using a garden hose found the front two windows were leaking.  I
> removed them. The foam seals around the windows looked in good shape. They
> are in one piece and not rotted. The screws holding the window in seemed a
> bit loose.
>
> What is the preferred method to fix this?
>
> I was thinking of slicing the foam seals from screw hole to screw hole and
> removing the outside section. Then running a bead of 3M Marine adhesive
> sealant 5200 about the thickness of the foam seal around the
> perimeter where I removed the foam seal.
>
> What are the two "U shaped reliefs" for along the bottom edge of the window
> opening?
>
> Larry Willis
> Serenity
> 1990 Rhodes22
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