12-04-2017, 09:09 AM
Black Walnut shell blasting has been around for a long long time - probably since the '60s if not before. It's very much still in use as it's environmentally friendly and very gentle - you can strip individual layers of paint off, leaving the undercoats.
Another similar technique now is Sodablasting, using bicarbonate of soda as the abrasive medium - widely used on buildings and delicate items.
I previously worked in the City of London - a couple of years ago the Bank of England was dramatically cleaned in the space of a few days (12 weeks elapsed but they only worked on the outside at weekends) by using a French dry power technique called "façade gommage" (face erasing) - this uses a proprietary powder, but is thought to be largely bicarb - it's extremely gentle on the surface of soft stone, so is excellent for listed buildings....
http://www.standard.co.uk/business/busin...53487.html
Another similar technique now is Sodablasting, using bicarbonate of soda as the abrasive medium - widely used on buildings and delicate items.
I previously worked in the City of London - a couple of years ago the Bank of England was dramatically cleaned in the space of a few days (12 weeks elapsed but they only worked on the outside at weekends) by using a French dry power technique called "façade gommage" (face erasing) - this uses a proprietary powder, but is thought to be largely bicarb - it's extremely gentle on the surface of soft stone, so is excellent for listed buildings....
http://www.standard.co.uk/business/busin...53487.html
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