Michka: yes, it was the white flexible stuff.
No problems painting although it's worth noting that the material has a finely grained surface which would be very useful for some things, buildings for instance to give a bit of texture, but maybe not for items that need to be smooth. Maybe for smooth items you could start with a coat of varnish to smooth it out?
Also, the models are more complex and detailed, which can make painting them a challenge

I saw a post here with the Moonbuggies, (yours?), and I thought ... Awesome

I may be getting a couple for another project.