Thanks all, this is exactly what I was after. I don't want to do all the work, only to encourage more corrosion in the future.
The knowledge base on this forum is awesome!
Keith
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In my recent investigations, the duralac is $10 cheaper at whitworths... but cheaper to buy at a Blackwoods store if you would require Whitworths to ship it to you. Whitworths wanted $15 shipping, plus a $15 surcharge for shipping a dangerous good.