On 21 Feb 2008, at 20:08, Terry Streeter wrote:
> Bruce Napier wrote:
>> AUIU
>
> Wossat then?
>
>
Late night finger trouble!
To paraphrase Dr Johnson, "Incompetence, madam, pure incompetence"
My understanding was based on Graham Booth's account in Narrowboat
Builders Book.
At BSC time, I had an interesting conversation with Mike Carter the
surveyor. He said he hadn't been able to get any coherent account
account from the makers as to *why* you need to grit blast before
applying 2 part over existing coatings - they don't interact, and the
epoxy grips the Comastic or Intertuf just as well as bare/gingered
steel.
Furthermore, the epoxy is a harder coat, so when scratched tends to
crumple away from the hull, in the manner of alu foil, and a layer of
more flexible blacking underneath provides some further protection.
Obviously, you'd still need to grit blast a new hull to remove mill
scale.
––
All the best
Bruce
"Never stay up on the barren heights of cleverness, but come down into
the green valleys of silliness.” Ludwig Wittgenstein
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