I have a '76 FJ40 thats red. I am going to spray the outside the original red color. Under the front fenders and wheel wells, I was thinking of using Durabak or Hercules roll on liner. I know Durabak has a smooth liner. Should I coat it in smooth or rough? How will a roll-on liner look compared to my nice sprayed paint job? Also should I use their standard red and hope it doesn't look to mismatched or just go with black. I am going to POR-15 the frame in black.