They had to change the formula for making gloss paints several years ago, the newer ones all go yellow after a few years. Diamond White wasn't, in fact they were sued by quite a few building companies. It isn't the manufacturers' fault, it's down to legislation and being greener. Go into B&Q and you will see that many paints are now missing, and in fact many paints are not even advertised as being suitable for outside use. As a gardener who used to design gardens for people, this caused much havoc. The acrylic gloss is pretty good but will never be as glossy as real gloss paint. You just get used to it. They are constantly trying to make something as strong and durable as the old gloss paints but haven't yet succeeded.