A few years ago I resealed the portlights
on my p28-1 which is very similar to the p30 in most respects including the portlights
. I put some information about the process that I followed and parts
that I used here:
Poolio's sailing and travel blog. : Pearson 28-1 window resealing and cleanup
In two years of sitting on the hard
(I'm still working on the boat) they didn't leak until the last few months. A leak developed on each of the larger portlights in the main cabin
at the seam of the seal that goes around the glass and inside the aluminum
frame. I could have prevented this in a number of ways but have just put a dab of butyl on the seam from the outside which has stopped the small leaks
on each window for now.
If I were to reseal these portlights again I would not use the stock/recommended foam in between the frame and the cabin
side but would instead use butyl there. In between the glass and the frame I may also use butyl or some other type of goop in replacement of or along with the rubber/vinyl stock seal.
In a world of unlimited time I would remove the fixed portlights, glass in the holes and install opening portlights, three to a side. Maybe one day..
Hope that helps,