Mark,
From my previous reply you can guess that I am not a fan of fiberglass for a
hull or deck. Unfortunately, it is very popular. My suggestion to your
dilemma is to use a fiberglass bonded structure to mount your liferaft on.
This structure can be wood or aluminum with slots for webbed belting. Use no
fasteners, drill no holes and bond with fiberglass to the largest possible
area and hope that a heavy sea does not separate the hull and deck joint. If
executed well, you will have a strong mount that will look like part of the
boat and be at least as strong as the boat.
Good luck,
Steve

"Steve Lusardi" wrote in message
...
Mark,
Fiberglass will not hold any type fastener period. No exceptions. As
fiberglass is a low density material, you must spread the load over the
largest area possible. If there is low density space between the outer
deck and the load bearer, you must use compression posts or tubes in
between. Last but not least, any hole you make through the fiberglass must
be resealed to prevent water absorption through osmosis along the length
of the glass fibers. This absorption, if it occurs, will hydraulically
jack the laminations apart leaving water filled blisters behind.
Steve

rk Hindley" wrote in message
...
I am trying to find a way for installing a liferaft on our Halcyon 27.

I only have the space to store it on deck and was planning to fix chocks
to the foredeck for the canister. However there is a fixed grp
headliner beneath so I have no access to install a backing pad and bolt
through.

Is is feasible to use fixings similar to those used for
plasterboard/hollow walls and just screw in from the top? What area do I
need to spread the load over for a 32kg raft?

Any other suggestions of how to manage this?

Many thanks

Mark