Yep I see where your coming from there..I agree it will certainly need some sort of oil based primer...youl struggle to find plumbate these days though, maybe all purpous primer (zinc phosphate) will do as a first coat.
One of my big 'no noss ' ....everyone cuts corners in some shape or form I spose but one thing I will never do is bang the copper pipes in while im emulsioning the wall..they will go green.
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