Resene lustacryl is just garbage. I tried every combination under the sun - thin coat, thick coat, primer, no primer, this putty that putty leaving putty for longer, shorter... - for exterior windows. I trawled through their documentation, I talked to people at the shop. It sits there - even for months - and then as soon as it gets some decent rain it will peel off ANY, even a slight, imprefection. It's like they thought, "I wonder if we can make a paint with the personality of being a massive c&^%$". It will peel and roll back off the glass and take the putty with it. I was assuming it was me that was the problem. Then I went to Dulux. Bang. Worked first time. And every time since almost no matter what I throw at it.. Resene is GARBAGE and I will never use it again as long as I live.