Painting outdoor metallic windmill.

If it is Aluminium, it would be a good idea to apply a primer intended for Aluminium after rubbing down the surface.
For steel you will need a different primer, such as red oxide.

If you spray, try to find a windless day, or set up a windbreak. Brushing Hammerite, tends to dry quickly, so work quickly and don't overload the brush, it won't spread too far before starting to dry out. Two thin coats are better than one tick one.

Yes, Hammerite, or a similar paint for metal (Wilkinson’s do their own brand and it’s very good).

I have used hammerite on my garden railings and they are lovely. You can get it mixed in loads of different colours at Homebase. I do think the smallest pot may be 250 ml though.

Car paints are good for this, you can but small ‘touch up’ pots.

Hammerite Smooth comes in several bright colours in 250ml pots, which may be bigger than you need.

Thank you all. I will have a look. I don't need a lot, a little pot of about 6 different colours will be sufficient.

I’d use Hammerite spray paint for metal, it’s very easy to use.

Humbrol tiny pots are great for outside. I use them for our front door furniture and it lasts for years!

If not, do rusteolum do small pots?

What about the tiny pots you can get to paint metal soldiers etc?and some thin artist type paint brushes?look on Amazon or the craft shops online.