Metal Ready, necessary? |
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Metal Ready, necessary? |
rjames |
Jan 25 2006, 04:41 PM
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#1
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I'm made of metal Group: Members Posts: 4,111 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest |
They guy at the local auto body shop said that metal ready wasn't necessary (probably because he was out of the stuff) before using POR15 as long as I did a good job of grinding all of the rust out.
This doesn't sound correct as I'll never be able to grind and clean up ALL of the rust particles... However, I've seen the instructions for the Metal Ready stuff, and it sounds like a big mess. Is there another product that's less messier that will do the same thing (assuming I need it)? Rubbing alcohol? (at least that stuff will evaporate on it's own). Also, I've got areas where I won't be able to wash the metal ready stuff out of if I apply it (center tunnel comes to mind). I can't just spray Metal Ready in there because it's an acid and eventually will destroy the metal- I have to be able to wash the stuff out. So do I just try and coat with POR15 using some sort of 'rag-on-a-pole' method?? New pics of the longs, rust etc: http://www.914world.com/bbs2/index.php?act=...&hl=metal+ready Since I have a couple of small areas to weld later, can I grind of the POR15 easily (or easily enough) when the time comes to weld those areas? (ie: holes due to rust) |
Katmanken |
Jan 27 2006, 09:36 AM
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#2
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
Shannon, the hard black stuff is magnetite or converted rust.
Rust is an electrical process. It forms charged cells. The attached picture on the left shows a cross section of a rust cell. The bulge at the top is what we see. Below it is a deep tapering pit of rust. When you sandblast, the sand particles penetrate as deep as they can into the pit but can't reach the narrow bottom...... On the right is an ospho or metal ready treated rust cell. The cell has been wire brushed to knock off the bulge, and then treated. The surface of the remaining rust cell is converted to magnetie, a hard stable form of iron oxide. How deep the treatment is, I can't say. But I do know from sandblasting, you can find rust underneath. The magnetite is a seal to prevent oxygen from reaching the metal below. The rust cell is still there, still wants to rust but is blocked. The POR or other paint acts as a shield to prevent the treated rust from getting the 2 things it needs- water and oxygen. |
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