Nope, no diesel added.
It dried very nicely on the boards. but on a blistering hot and humid day, the steel dont feel fully cured.
You dont notice it as being "wet" or wont get any on you if you brush against it. But if you take your fingernail and dig at it, its like digging at a seam that was sealed in asphalt. I think it will be excellent for everything out of sight. The jury is still out on the areas that get touched frequently, like the GN and the sides and ramps...