Brad93
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- 18,187
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- Essex, United Kingdom
I use this. Gotta be honest, scares the hell out of me. You MUST use the neutralising paste. That stuff can drop on concrete and still be fizzing after 5 minutes.
I believe it's Nitric and Hydrofluoric Acid. It's the Hydrofluoric which is the proper nasty bit.
A spray is much better really because you get a uniform appearance rather than an obvious etched area. But it's not as powerful. Great for new fabrications or where you can clean everything with an abrasive.
But when you're doing stainless repairs, it rarely comes out as a clean weld, there is usually some slag or discolouration. That's when you need the proper paste.
A much safer but more expensive option is electro-passivating or electropolishing. Just uses harmless phosphoric acid and dc current.
I believe it's Nitric and Hydrofluoric Acid. It's the Hydrofluoric which is the proper nasty bit.
A spray is much better really because you get a uniform appearance rather than an obvious etched area. But it's not as powerful. Great for new fabrications or where you can clean everything with an abrasive.
But when you're doing stainless repairs, it rarely comes out as a clean weld, there is usually some slag or discolouration. That's when you need the proper paste.
A much safer but more expensive option is electro-passivating or electropolishing. Just uses harmless phosphoric acid and dc current.