I’ll agree with the above: I just scrape most mould lines away with the sharp side of my modelling knife. If the surface really needs to be flat, I’ll use a diamond file (a set like this costs you next to nothing and should last forever if you just file plastic kit parts with them), but usually, the knife will be enough.
For the parts you showed, though, you likely won’t even need to remove the mould lines. They’re on the underside and will be invisible, or almost so, with the tank on its wheels.
As for fitting the wheels before or after painting, again, as above: that depends on preference — and therefore, experience
However, my take on it is that, if something gets in the way for painting, it’s probably best to leave it off until afterward. On a Churchill, I would put the drive sprockets and idler wheels in already, but leave them loose (so you can rotate them to paint them all over), but only fit the roadwheels after painting both the suspension and the wheels themselves.
For the parts you showed, though, you likely won’t even need to remove the mould lines. They’re on the underside and will be invisible, or almost so, with the tank on its wheels.
As for fitting the wheels before or after painting, again, as above: that depends on preference — and therefore, experience

Comment