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As the name implies, this is a weld that it brushed on. It is used by the 'clever' DIY'er to 'fix' holes in cars which would otherwise fail roadworthyness test. Brush on weld takes the form of either underseal or seam sealer. Since it is much easier to apply than a proper metal weld, in that it doesnt actually join any metal together, it is within the grasp of most spanner monkeys.
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