I used caulk, I think it was Soudal around all my new door frames and skirting tops. I’d used caulk before with no problems. I allowed to dry for a good 36 hours. But then I painted Dulux over it. I never primed it in the past as I never had a problem. Here’s how it has gone. 1st coat - looked ok 2nd coat - looked ok 2 days later - staining coming through. Internet search suggest undercoat 3rd coat - undercoat 4th coat - undercoat (to be sure) 5th coat - emulsion 6th coat - emulsion 3 days later staining coming through Internet search suggest Zinsser Bin 7th coat - Zinsser 8th coat - Zinsser 9th coat - Zinsser 10th coat - Zinsser (wanted to be sure) 11th coat - emulsion 12th coat - emulsion It’s coming through again !! I’ve used this bloody caulk everywhere. I’m fed up painting. It looks worse than ever. I know it will be suggested to dig it out and start again but I’m worried about really making a mess. Any ideas from anyone??