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Larry Gagnon wrote:
On Sat, 16 Jul 2005 00:30:33 +0000, RadioGuy wrote: Howdy: Its been a common practice with me to finish the aluminum surface of a chassis or box with an immersion into a caustic solution followed with a coating of clear acrylic spray---I like the satin finish it produces. I normally use lye that I regularly found on the shelves of our neighborhood hardware stores. However, I've been having a harder time of finding the flaked lye that I have used over the years for that purpose. I have used 'Lewis Red Devil Lye' that I found at Ace Hardware. [snip] Am I correct in understanding that TSP, also called Sugar Soap (the stuff used by many to wash walls before painting) is essentially mostly lye? If so that is quite a cheap source you might want to consider. TSP is Tri-Sodium Phosphate; lye is Sodium Hydroxide. They're different compounds with different properties. Sodium Hydroxide is incredibly nasty if mishandled: the human body does not handle strong bases well, and Sodium Hydroxide eats flesh with terrible avidity. It's really, really easy to lose meat or an eye to a drop or three in the wrong place. I wear long gloves, a plastic apron, a long-sleeved shirt, goggles _and_ a face shield whenever I have to work with it. TSP, while much less nasty, is still nothing to play with. Google for the Material Safety Datasheets (MSDS) on both. -- Before long, Microsoft will attempt to patent the alphabet (hoping we'll have to pay royalties to use our keyboards and keep their stock solid). -- Phil Paxton |
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