I tried applying some paint to the gloss undercoated Humvees last night.
I painted one of the tires and to my joy it appears to stick!
I think I'll still need to give them a decent coat of clear coat to protect them, but I'm happy that I haven't completely destroyed them. And as it's dried, some of the detail has come back, so things are looking up!
The main cameras at home are full of baby pictures, so I haven't been able to use them. I tried to take some pictures this morning with my phone again, but these have proven to be terrible.
I'll bite the bullet and take some proper shots tonight.