I see some lofts that are painted inside. What type of paint is best? Toxicity? How many coats? Durability? I can see renting a sprayer and just blasting away a few coats. A touch up coat every other year or so and it might stay nice and bright. I grew up on a farm and we would have the inside of the barn 'whitewashed' every once in awhile, which I understand was a lime spray type thing. Thanks in advance for any advice.