Just about to buy an old Hobie 16 cat and in one area a soft spot.....cracked and spongy. What is the best way to repair something like this.
"Just about to buy" as in you haven't actually purchased it yet?? Perhaps you may want to rethink buying this particular boat.
"Cracked and spongy" are not qualities you want to see when looking at used Hobies. If you haven't bought the boat yet, you may find it's in your best interest to keep looking for a better boat.
The injection repair presented above works for small areas of delam. But if the area is cracked and spongy, that could likely mean that the fiberglass skins are fractured and the foam core is deteriorated and/or water logged. This could mean a more involved repair than simply squirting in some resin.