The only place i had to do that on the El Camper was for the anchor cleats. Some layers of ply bonded to outside of hull and glassed over and out onto hull to seal and spread loads. Bolt through into the ply.
Fill drill holes with epoxy and high density epoxy bog (cabosil). Or overdrill with larger size drill bit, fill hole with high strength bog, let set and then drill actual size holes.

All other things usually screwed on were done pretty easily with composites (bog and tow or cloth, and also some SS pins used too).

--------------------------------------------
On Mon, 18/6/18, StoneTool owly@ttc-cmc.net [harryproa] <harryproa@yahoogroups.com.au> wrote:

Subject: Re: [harryproa] Hard Points in foam sandwich panels
To: harryproa@yahoogroups.com.au
Received: Monday, 18 June, 2018, 7:06 AM


 












Chris:

    Aluminum does not bond well with adhesives. 
It is done in
aviation all the time, but in extremely controlled
conditions with
rigorous surface prep, and even then it has little
peel
resistance, requiring mechanical fasteners along the
edge for
insurance.   It's of course a different
situation when it is
completely encapsulated.   I'd look at bonding
in a wood strip,
and perhaps screwing an aluminum wear strip over
it.........



                           
                               
   
                           
                               
   
                        H.W.



On 06/17/2018 04:15 PM, Chris Purkiss chrispurkiss@bigpond.com
[harryproa] wrote:



 


Good question.  I have been pondering the
same thing..



Another question along the same vein. I am
planning my
next build to be a rowing dinghy using robs
methods. The
problem with is dragging the dinghy over the
shore chews
out the paint and the fibreglass. Has any one
had any
experience laying a strip of aluminium into
the layup
before infusion so it is bonded onto the
hull?



Chris Purkiss
M. 0428755749



On 18 Jun 2018, at 4:12 am, StoneTool owly@ttc-cmc.net
[harryproa] <harryproa@yahoogroups.com.au>
wrote:





 

    Every boat requires some if
not quite a few
"hard points" where

something bolts through.  Obviously
the core must
be something other

than foam here, and more layers of
glass must be
used to spread the load

over a large area.   A dense wood
would work well,
but would present rod

opportunities.   What's the best
material to
replace foam where there is

compression load combined with jerking
and
tugging, such as where an

anchor or drogue, or even dock lines
must connect?



        H.W.





























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