Want to transform dreary metal garden furniture favoring yellow or light green. Have looked in two major garden, diy stores and have only found black or dark green.
I would go to the likes of Halfords, car spray paints tins maybe? Loads of colours and should surely be suitable for outdoor metal. Might be an expensive way of doing it though if you have a lot.
I buy a tin of "seconds" paint from any paint shop and give them a once over. You can pick up a tin for about a €5 and lots of colours to choose from. Works good as well.
There is also a place beside the old Merlin Motors auction rooms that sells spray paint in a can, any colour you like. Near their Ballyfermot (now closed) showrooms.
Homebase have a wide range of colours in spray cans for metal and wood. They are not Hammerite but are displayed separately from the Hammerite products. I think you might get something suitable for your garden furniture there.