I have recently re-painted my original sash windows on a 1900's house. I sanded the paint back, removing all loose paint. I primed the bare wood with water-based primer and used an oil based, undercoat. I then put on an ob top coat of dulux weathershield. However the paint has wrinkled (see photo) in many places and it is still wet and gooey under the paint in these sections.
I know that the undercoats were dry as they were left for 24 hours minimum in good drying conditions. When I did the top coat it was a fairly moist, yet warm day, but did not rain when applying the paint. It may possibly have rained a little overnight.
I have now scraped off the paint and have sanded the windows ready to try again. However I don't want the same thing to happen again. I have painted hundreds of times and have never experienced this. I therefore wondered what people think has gone wrong, so I can make sure it works next time.
Thanks for your time, all suggestions appreciated.
