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It's unusual for the weathershield system to fail but the formulation of the newer water based one is nowhere near as good as the old oil based one, especially the very thin initial primer that comes with the new version is not a patch on the old one. Apparently the old one is pretty deadly to fish or something like that.
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The stuff I used was thin and green, not like any primer I have used before. It supposedly went with the oil-based undercoat and topcoat I used but the results were poor. The adhesion of the undercoat to the primer layer was, as I remember, very bad. I should probably have abandoned it when I got to that stage.
There’s a dog’s dinner of paint finishes across the windows and door frame. God knows what the guy who painted the window for me used but as you can see it’s falling off. I did the door frame with the dulux weathershield three part system and that has been a bubbling disaster. My repaint of the window sill was Little Greene exterior emulsion: that has held up relatively well, but a crack has opened up there as a result of the underlying issues. Thanks again to both you and Bobbo for the advice. I’ll order some repaircare for the door and see how I get on. I am hoping the frame issues and window will be addressed in the forthcoming works. I’ll be sure to pass on your thoughts to the contractors.