Some years back (possibly 10-15) I stripped to bare timber and painted window timber surrounds using Taubmans Living Proof Gloss Acrylic. Over the years the paint on the sills facing East have become as shown in the photo below.

I think looking at the image I have 2 possible issues
- Poor surface prep
- Failure to choose a more sun-resistant paint e.g. Taubmans Sun Proof
Any ideas anyone.