Horrible Experience

Two and a half years later and I find paint coming of my vehicle bought through the dealership. To my own eye(not a professional dealing with buying second hands cars and reselling them), seeing the spray work done on the vehicle wasn't obvious. After Hyundai and a panel beater inspected the vehicle they immediately picked up that there was spray work done on the vehicle. My problem is this, why didn't this dealership do more work on inspecting the vehicle before selling it to me or did they in fact know about the spray work done, but not notify me? I guess I'll never know and now I need to cover the unforseen bills.