I just started reseating the plexiglass in my hatches with GE SSG4000 UltraGlaze Silicone Structural Glazing Sealant
. I have Bomar
hatches and this is what they recommend. I am working with aluminum
instead of wood but I don't know if that makes any difference. Pretty easy to apply but you gotta be careful since it seems to want to get everywhere somehow but you can clean up pretty easily with acetone before it cures.