Have a think about doing it yourself with a spray gun. You can get a small compressor that produces enough air to spray with a gun in the region of £70 to £80 at Aldi etc. If it's desert it would never have been done perfectly, it would have been a quick blow over the OD. It's much easier than you think! The secret is to spray even coats and the first I find should be a light dusting (spray a paint/thinners tin to test for touch), then just as it's tacky (use the spray on the can to touch test, if the can sticks to your finger and you can pull the can, it's just right) put a heavier coat on.