Bill,
There is a 4x4 place on the South side of the Clyde near to Dixon Blazes and it is called Monarch Garage, they are at 47 Colvend St, Glasgow G40 4DU. Phone number is 0141 554 3844. Their web site advertises that the customise vehicles so I assume they have access to painting if not they may be able to point you in the right direction. I used them for a service a couple of month ago and was happy with their service, plus it was a lot cheaper than the dealer.
Regards,
Pipespark.