Modern Vespa

I mean, what's the worst can happen?

I don't know if you chose the right type of paint, yours is for ferrous metals, I don't know how it will look on aluminum.

We'll know tomorrow!

Wheel all masked up and first coat on. 2nd coat in around 4 hours. Then another if needed tonight.

I had to remove the wheel for a puncture and when it was off I realised the powder coating was done; loads of it just peeled off. So I've wire brushed off anything loose and sanded it back to good metal. Even if the Hammerite doesn't take, it'll at least protect the alloy until I get them professionally sorted.

probably needed a primer first, but as it is done and temporary should be ok.

You'd have had a fighting chance of getting a few years out of it with a coat of aluminum spray primer.

Without a decent aluminum-specific preparation (and often even with it), aluminum is notoriously difficult to get paint to stick to. That's why you see so much anodizing and powder coating on manufactured aluminum parts.

It will be interesting to see how unprimed Hammerite fares before it starts to look shabby. My guess would be six months, and the edges will go first. Maybe though your expectation horizon is less than that.

If it lasts 3 months I'll be chuffed! It really is a stop gap until the wheels get restored by a pro. Priority is new suspension units, about to order some Bitubo's. Then when the pot is refilled it'll be new tyres and wheel restoration.

Heat the paint up , used it yesterday on my rusty stand and is so smooth when you aply is warm
I put it in hot water

Well it's done. Two coats on, masking tape carefully removed, and it actually looks far better than I thought it would. Of course, how long the paint stays on is anyone's guess, but if I get a couple of months out of it I'll be more than happy.

I could be wrong, but I thought zinc chromate primer is what's needed to make any paint stick permanently to Aluminum or Stainless. No ?

Yes (among others) but chromates have become much more difficult to get due to environmental and health concerns.