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Old 05-18-20, 08:26 PM
Andrew R Stewart 
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Agreed that the right flux for the filler is a must. Getting both from the same source will make this a no brainer. Get much more then you thing is needed as you'll want to practice a bunch before burning any flux on the frame

Tiny points of body filler is no big deal. Lots and when it's thick is much more an indicator.

Don't know what you mean by "pool acid". My experience with chemical cleaning prior to brazing never proved successful. Andy
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