Question
What removes calcium plumbate from a cast iron fireplace?
David
Answer
Hi David
As you have, no doubt, found calcium plumbate sticks very well to some metal surfaces and can be difficult to remove. A further complication is that the high lead content rules- out some obvious mechanical solutions since this would cause contamination.
A chemical-based stripper may be your only hope and, unfortunately, this can be a case of trial and error because some work better than others.
I would avoid some of the ‘extra-powerful’ options because they can react badly with metal surfaces – causing severe oxidation – so the proprietary brands tend to be the safest option, although not the most effective.
To put it simply, it can be a slow and tedious process but try a few different brands and, to be safe, do a small test area first.
Sorry, I can’t be of more help.
Regards Darren
Decorator
Where could I buy Calcium Plumbate primer can’t find a stockist
Darren
Hi Carol
You can only buy Calcium Plumbate from a trade merchants for professional use because of the lead content. Before using you should familiarise yourself with the hazards of working with lead and what precautions to take (especially for women of childbearing age).
http://www.hse.gov.uk/pubns/indg305.pdf
For painting galvanised steel there are safer water-based alternatives available such as Quick-Drying Metal Primer
https://www.tradepaintdirect.co.uk/dulux-trade-metalshield-quick-drying-metal-primer.html
https://www.rustins.ltd/rustins/our-products/speciality-paints/quick-dry-galvanised-metal-primer