How good is good enough, DAPO? |
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How good is good enough, DAPO? |
930cabman |
Jan 15 2024, 06:29 AM
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#1
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Advanced Member Group: Members Posts: 3,130 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States |
Given this former Cali car is coming up on 50 years and probably not always taken good care of, I am lucky to have this level or rusting. I went after it with Ospho, wire brush and clean rinse. Will be applying POR 15 to this area. Question: my gut tells me the well adhered tar is sound and is not hiding any rusting. |
930cabman |
Jan 16 2024, 07:48 AM
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#2
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Advanced Member Group: Members Posts: 3,130 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States |
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rjames |
Jan 17 2024, 03:47 PM
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#3
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I'm made of metal Group: Members Posts: 3,948 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest |
Almost passed the awl test, one small (less than 1/4" dia.) is all that I could get. Also, the poorly adhered POR is gone. It gripped to the rusted areas, but not at all to the clean surfaces. Likely the POR15 didn't stick to the clean surfaces because they weren't prepped properly. I seem to be a regular POR15 apologist, but I'd bet that most don't do the requisite prep work before applying it. I did my floor pan 17 years ago after removing all of the surface rust and it looks the same as the day I put the stuff on. At the same time I also did my rocker panels (inside and out) thinking I'd end up re-stripping and painting them later when I got the car repainted (hasn't happened yet (IMG:style_emoticons/default/dry.gif) ), and they've held up 100%. |
930cabman |
Jan 17 2024, 04:51 PM
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#4
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Advanced Member Group: Members Posts: 3,130 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States |
Almost passed the awl test, one small (less than 1/4" dia.) is all that I could get. Also, the poorly adhered POR is gone. It gripped to the rusted areas, but not at all to the clean surfaces. Likely the POR15 didn't stick to the clean surfaces because they weren't prepped properly. I seem to be a regular POR15 apologist, but I'd bet that most don't do the requisite prep work before applying it. I did my floor pan 17 years ago after removing all of the surface rust and it looks the same as the day I put the stuff on. At the same time I also did my rocker panels (inside and out) thinking I'd end up re-stripping and painting them later when I got the car repainted (hasn't happened yet (IMG:style_emoticons/default/dry.gif) ), and they've held up 100%. I did not use their "Metal Prep Etch". Suppose any product will not work if the manufacturers instructions are not followed. I did use Ospho on the rusted areas and POR 15 appears to have bonded well in those places. I think BITE is the key phrase here. What will grab steel with good adhesion? |
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