Just remember to let any paint/chemicals fully gas out before you move them inside and put into use.
There is another option, I have bare MDF racks that only show a little wear from sliding the tubs in and out BUT no water damage at all.
Build your racks with lids on the tubs.
It can be a little pain taking the tubs all the way out to take the lid off but when it comes to cleaning it is nice because you don't have to get all in the rack to clean "paint" off of it.