[C320-list] Leaking Opening Port

[Christian]

My fore most, starboard side, opening port light is leaking pretty bad.

This opening port light is the original Lewmar model (aka Old Std),
original Plexiglas.  I've replaced the O rings in the dog ears.  I've
replaced the Plexiglas gasket.  I've tightened all frame screws.  Still
leaking badly.

I now believe the leak is coming from the aluminum frame, and should be
rebedded.

Any pointers for doing this job?  Don't see any material on CatalinaDirect
for suggested material for rebedding (but plan on contacting them shortly
for suggestions).  I have some of marine compass' butyl tape arriving later
this week (for another job).  But I'm guessing since it's not a high
flex/stress area, there is probably better bedding material.

Thanks,
Christian Caperton
1994 C320 "Canuck" #138
Monroe Harbor, Chicago, IL