Where is this spot occurring on your hull? I had soft spots on my '79 hulls just in front of the forward pylons, and I understand that this is a common place to get them.
If it is indeed a sure-fire soft spot, you're gonna have to cut out port holes or inspection ports to air them out. That's what I did and it seems to work fine. Just make sure that you use high quality sealant, dont settle for the cheap stuff, because I could really tell the difference.
hope this helps
This is a common place for delamination because it is highly stressed. When the main is sheeted hard the fore stay and main sheet pull up on the ends of the boat while the mast and front beam push down trying to bend the hulls. the deck in front of the pylons gets loaded in compression. IMHO this is not a good place to be cutting a hole in the deck. I recommend using the epoxy injection method on any boat you expect to be sailed hard.
