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Sheeeeit, I always forget to take & post pics.
Yeah, I evaporusted the frame & fork.
What I use is a squirter bottle from the local restaurant store w/ the WD40 red straw on it & vinyl tape. That particular straw has oddball dimensions, but it's perfect for this.
Put the juice in the squirter, and blast it into the weld gas exhaust holes. They'd be a pain to fill otherwise.
I wouldn't say this frame was "bad" in terms of rust, but it's maybe the worst of my bikes. Most was in the bb shell. Not so worrying since it's singularly the thickest bit of steel & the threads are in good shape.
That's the top pic. Middle is the red straw setup.
Bottom is the evaporust after vs before. This stuff turns black as it undergoes the reaction. Residual oils are what cause the 'clinging' effect on the RH.
After I 'drained' the frame & fork and let it dry, the inside got a blast of rust inhibitor.
Different people like different things. We use CRC SP-350 at work, and it works well enough. I borrowed a can... add $0 to the build total.
Next pics will be parts from... CL, Somafab, a bmx shop, Rene Herse, Bluelug.