I have used the new Hammerite, and its the last time I will buy it. The new version is a completely different formulation, like almost all paints currently produced, and its composition has been changed to conform to current regulations. A paint supplier will confirm this.
The old Hammerite was based on glass flakes and was marvellous stuff (1970s) but subsequently changed in, perhaps, the 1990s to its detriment. Still worked to some extent (but I can tell you the weather resistance was much reduced). Changed again, totally, a couple of years ago.
I have now used up my old stock, and have had enough of the new stuff. It's a huge disappointment.
Marcus