geekhack
geekhack Community => Off Topic => Topic started by: granola bar enthusiast on Mon, 20 June 2022, 08:13:22
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ok so yesterday i was walking around a Rejuvenation yesterday and I overheard a conversation of some kid pointing out to his dad how you can see the marks on this table from when it was machined and their advertised "powder coat" didn't fully cover it. This caught my attention and has been bugging me since. Is it possible to coat layers (example: anodize or paint table to natural color to remove machining marks then powder coat)? Or are there thicknesses of powder coats or can you double powder coat? I'm just a stupid kid but this has piqued my interest, thanks in advance!
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Anodizing is suuuuper thin, can't be layered and doesn't even like being painted over. It's pretty much just tinted oxidation/metal tarnish and you usually remove it then sand/media blast it before painting, especially powder coat.
Powder coat on the other hand is coat is more like a thin plastic coating than a paint and is as thick or thicker than sprayed on paint. While you can do multiple layers, to a degree, it's more often used to add a second color or change the color, not build thickness. You also need to sand/media blast or use a really aggressive etching primer for the initial coat or it will peel off in chunks.
Paint/Finish is 90% prep, 10% paint, it can hide some misdeeds but for the most part if you don't do proper prep there's no fixing it with paint.
The manufacturer would probably try a second coat on that table (to save money), and it miiight work, but odds are it needs to be media blasted clean (something they probably didn't do to begin with or you wouldn't see the marks) and redone.