The devil is in the details, huh?
I’m thinking of writing a technical paper for TRS on the 87 different ways to clean and polish and buff diamond plate, while still getting totally crappy results. I still have about half of the trailer to go, so I’ll wait and see if I come up with another 10 or 15 different ways, maybe hit 100.
I have made a little progress. It’s the “20 foot” type of progress.
I think you can see the difference in the upper deck, and the first sheet on the lower the closest to it.
Those dark, almost black discolorations are where some of the sack of concrete sitting on top of the stack of sheets seeped in between the sheets.
I spent a ton of time on the upper deck. Might be hard to see, but there are several independent sheets of diamond plate up there. There’s one big sheet that’s about 60% on the right hand side, and then four smaller plates make up the left-hand side (because that’s where my access panel is for the main electrical). I didn’t do anything to the sheet on right and it still needs a little cleaning. I did all kinds of stuff to the sheets on the left. No matter what I cleaned it with or how I cleaned it, it wouldn’t remove that black staining. I could clean it up, and even make it shiny, but it was that kind of whitish shiny. The original sheets have a mirror finish, and in comparison, actually have a touch of a blue/gold tone.
To get the black corrosion off, I used a very fine wire wheel brush in a drill. I very lightly ran it over the black corrosion in one direction of the diamonds, and then I ran it 90° to that, going back-and-forth until the dark corrosion was gone. I did it very lightly so I didn’t gouge The Aluminum.
When I put the acid stuff on it to clean it before I buffed it, I had to be careful because it would immediately start to tarnish the raw Aluminum again. I wiped it off quickly, and immediately put on the paste. That’s where the second headache came in.
I have every buffer known to man, and I even got creative with different things to try to buff it. The most successful was using a buffing wheel like would go on a bench grinder. I opened up the hole a little bit in the middle, and I put it on an angle grinder. That high-speed did an OK job, but no home run.
When I did the first sheet on the lower deck, closest to the front, I just wire wheeled the dark spots as described, cleaned the sheet very quickly with a nylon scrub brush and a little muriatic acid, rinsed it with a mild vinegar solution, and then I used the polishing paste. The results certainly don’t match the original diamond plate, but it’s fairly quick, and from 15 feet away you can’t tell. If you’re looking straight down on the sheets, you can see it very clearly.
But hey, at the end of the day, it’s a work truck…