We expect to close on a house on Friday and my father-in-law will be in town that weekend only to help us paint a couple of bedrooms (currently brightly colored) and an accent wall. So we need to test colors quickly rather than giving the primer a day to dry and the paint a day as well. My builder friend says to get gypsum board and spray it with orange peel. Another authority says plywood or cardboard (??) is sufficient. Do I need to acquire gypsum to do a good quality test? Can I skip the orange peel at least? (And wouldn't the brown of cardboard hurt the testing?)
Obviously, our intent is to place the board in different parts of the room to test how the color looks. We can't order test boards online because that would take too long for shipping, and I like to keep costs down.