The soft spot is from the skin/foam/skin sandwich separating. Glassing inside will build up the inside skin and add weight without fixing the problem.



You could turn the hull upside down and from the port, drill the series of holes, mix the epoxy, inject it and tape each hole as it starts to overflow. However, my arms aren't that long. ;>)



The best thing to do is drill a series of two holes every four inches overlapping the soft spot. Use graph paper as a guide. Drill only the top skin (about 1/8 inch). DO NOT go thru the second skin. Mix up epoxy and inject it into the holes until it flow out the next holes. Wipe and tape the holes and move on until you have reached the other end. Don't mix the epoxy hot. You don't want it to set while you are working. If you take your time and do it right, most people won't notice. And don't use fiberglass resin. I used West Systems on both sides of my TheMightyHobie18.



If you don't want to attempt this, half the Hobie owners have done this. And for the price of a few beers....



Spinakerjohn