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I've had a couple of paint jobs that wouldn't shift ( easily ). I think just patiently keep battering away at if Flo.
You'll get there in the end.

I'd add media blasting & single sided razor blades to caprinut's list

Yeahhh a media blasting cabinet. A dream.
I grit with flat screwdrivers and synto knife.

I would suggest a stronger solution of the caustic soda.

The mix should get fairly hot if it working correctly.
And place lid over the box.

When I did it some years ago I also removed chrome from some Lunchbox parts and HPI Superstar wheels.
The chrome was gone in matter of seconds.
You could test with some chrome parts you are not using.
I remember the solution got hot.
Don't remember the mix ratio I used sadly.

4 bottles of gelified caustic soda + 200g of soda crystals+4L of water.  That works but not so fast I hopped. The mixture works faster on my fingers :DI puted the spare fake wheele of my ww2 body inside too. I will see tomorrow for it.

Work in progress with the horible orange.

Your definitely winning.

Yessss Al. I'll do it

Flo, I've got a few things that need the paint stripping from, but I'm running out of Graffiti remover so I feel your pain on this one.

I tried a grafitti remover one my blazing blazer but the result was dangerous with the abs.