Just thinking about your problem with the undercoat. And my mind wandered back to the past, and a project that I had while at the research firm. The crux of it was how to remove coal tar coating on linepipe. Air Liquide (Liquid Air here in the US) had developed a way to freeze the coating on linepipe to make it brittle and a modified wrapping machine to knock it off while frozen. The project determined that it did not damage the pipe, which was my part of the project.
Next, I remembered that someone makes a rotary stripping head that uses wires that flail out and strip stuff, don't remember who, what, where etc, but here's my take on a setup that any of us could use.
Dry ice (solid CO2) to freeze the coating, and a needle scaler to do the stripping. Both are relatively inexpensive, many of us already have a needle scaler, and dry ice is cheap. Well if there's a supplier nearby. Get the Cheetos size, pack it on the coating in small sections, wait for 5 minutes, and hit it with the needle scaler. Obviously don't use it on thin body metal, but for the heavier cross-section areas, have at it. But at a very flat angle, for a peeling effect. Just a thought, for what it's worth...
Next, I remembered that someone makes a rotary stripping head that uses wires that flail out and strip stuff, don't remember who, what, where etc, but here's my take on a setup that any of us could use.
Dry ice (solid CO2) to freeze the coating, and a needle scaler to do the stripping. Both are relatively inexpensive, many of us already have a needle scaler, and dry ice is cheap. Well if there's a supplier nearby. Get the Cheetos size, pack it on the coating in small sections, wait for 5 minutes, and hit it with the needle scaler. Obviously don't use it on thin body metal, but for the heavier cross-section areas, have at it. But at a very flat angle, for a peeling effect. Just a thought, for what it's worth...
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