I used some metals one time in an older boat, and to bond it i put some wet epoxy on the metal surface and sanded it so the epoxy and the metal surface and dust particles were all being mixed into the slurry. Then add what ever you want to bond on with epoxy bog and glass or whatever.

--------------------------------------------
On Mon, 18/6/18, '.' eruttan@yahoo.com [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, 7:42 AM


 









Actually, you can buy a kit from basically any
aircraft kit supplier with the chemicals to prepare the
surface.



Again, it's rather common for home glass plane builders
to do this.



On June 17, 2018 11:06:24 PM UTC, "StoneTool
owly@ttc-cmc.net [harryproa]"
<harryproa@yahoogroups.com.au> wrote:

|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


|> <mailto:owly@ttc-cmc.net> [harryproa]
<harryproa@yahoogroups..com.au

|> <mailto: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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