Concrete technology is changing rapidly, but as far as I know, it is still soft (relative to stainless or copper) and needs reinforcing, both of which mitigate against it for reef scraping.
On Sun, Jul 8, 2018 at 11:14 AM, eruttan@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
Rob;I had a thought about concrete. Thought I might throw it in as a sacrificial coating and easy to locally source and work with. No idea if it has merit.
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Posted by: Rob Denney <harryproa@gmail.com>
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