Stop off paint

Sometimes it is neccessary to prevent galvanizing occuring on a particular surface as you need to protect threads, leave a welding area or maintain a dimension (like an axle for a trailer). The best way to do this is to apply a stop off. These are usually silicon or paint based. If this has been deliberately done to provide a “raw” steel area for further work, then this is not cause for rejection. this area may exceed the repairable area allowed under the standard, but obviously needs to be treated differently.

black stop weld peeling uncoated

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