We too have Lewmar ports
,and they sometimes leak in heavy rain. Spoke to a hatch
repair pro about it, thinking that we would also replace the gaskets. His reply was, first, it is VERY hard to get the new gaskets installed in situ. They have a sorta arrowhead shaped flange which you have to thread through a slot all the way around the frame, and it is bloody hard to do... often tearing the gasket
in the process. HE suggested first that they were probably not that badly degraded, and that the first thing was to carefully clean their surface with meths or similar solvent. Second, coat them very lightly with silicone grease. This process certainly helped ours... He also said that another leak source was the two rubber inserts between the upper and lower halves of the frames. The outer portions of these are exposed to sunlight and can degrade. He suggested that we carefully dig out such degraded material and replace it with Sika or such sealant
. We've not tried this yet on the one port that still sometimes leaks
Good luck with your project
, and please post your experiences when done. There are lots of fellow Lewmar users out here!
Jim and Ann s/v Insatiable II lying Salamander Bay, NSW, Oz northbound at last