[quote=Dogboy]It all depends on the extent of the damage. Epoxy injection is a totally effective and legitimate repair process (even used to repair high end aerospace composites) as long as you're only repairing a small area and the foam core is not highly deteriorated. In essence, if you are able to identify the soft spot early on before it grows or the laminate (core material or inside fiberglass skin) are damaged, then injection is for sure the way to go.
If you wait too long and the inside glass skin cracks or the core starts to break down, then epoxy injection either won't work (the epoxy will leak into the hull) or will add a huge amount of weight (epoxy would need to fill the entire void where there was once foam). In that case, you would need to cut out the affected part of the hull and rebuild the structure.
Slathering expanding foam on the inside of the hull might be a quick short-term solution, but it's not a very controllable process so it may not hold up long-term, especially without having any glass reinforcement.
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