I own a tamiya pershing for 2 months and recently I notice cracks in my idler road wheels thus I took them apart and found that the plastic is breaking apart from the insides. I thien procced to take all my road wheels out and found that every one of them have the bearing support broken. Is this normal or is the paints I used to paint of the ABS plastic causing them to become brittle? I used testors spary paint of the tank.

There is a gap between the bearing suppot plastic and the rest of the wheel do I need to fill it with soem sort of glue to increase support and if so what glue shld I use. I have already ordered 5 spruce As to get the roadwheels but I want to prevent this from happening again. Please advice, thank you