A solid foam float covered with fiberglass is pretty tough. A rip in the glass in not catastrophic. And it is not likely to crush under the force of a hard landing. Your layup would make a pretty tough kayak, but I you would have to ask someone else if it is good enough for a float.

: Nick...I dont think there is a float made that could withstand the impact of
: a rock at 50mph. Im just trying to build a stucture that wont collapse
: under normal use. Ive seen a few UL float models in the past. The glass
: work is surprisingly thin...Maybe 3 or 4 ply at the most. I saw one set
: with a hot-wired foam core covered by one ply of 1oz deck cloth. They were
: super light...But IMO not strong enough.

: Right now Im thinking 1 possible 2 layers of 5oz plain weave s glass followed
: by 3 layers of BID Keval 49 style 281. I can also reinforce the keel and
: chine areas with BID Kevlar over honeycomb or foam core or maybe apply
: some UNI Kevlar is key areas.

: IU dont think I need many layers if I handle the internal reinforcement
: properly.

: Ross