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Iron stains on new painted pebble dash? Pic

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slumbalumba Wed 06-Apr-16 09:50:50

I have a new extension, externally insulated & rendered with painted pebble dash to match the existing. We now have several 'bleeding' iron stains - see pic. I don't want to dig out the affected areas as I don't want to risk hacking at the insulation underneath. If I thoroughly coat the area with a quality exterior stain-block & repaint, will that be enough to stop the stains reappearing?

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