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Hi Alan (anglooff), just as a clarification I didnt mean differant brand names, I meant differant paint types. As Alan W. said there is an order that you can lay paints over one another. If you have a scratch and it penatrates the polyurethene but does not go all the way through to steel then you can recoat with poly. However if you go through to steel then you need to feather back, paint with a primer (epoxy), high build coat (epoxy) and then top coat (polyurethene). By the way Zinc rich primers are not nessesarily the only way to go. These days two part epoxys with high aluminium solids are being used in industrial aplications. That is because they are "surface tolerant". This means that they can still provide good protection even if the surface preperation is not perfect. (Think oil rig) That is not to say you shouldnt always aim for the best possible preperation. As an old shipwright said to me " dont believe the crap mate, the only thing that stops a boat from sinking is paint" !!
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