Edit: Ohuhu sent me another batch of these panels and they are much better. It doesn't have much primer on it yet, but the cardboard seems harder. As long as they don't deform that much. I definitely think you need to put another coat of plaster on top if you're painting, or a few coats of some sort of sealer if you're casting. I applied a few coats of spray paint before pouring acrylic and then they didn't warp at all. ------------------ First Review ------- - If they actually charge, they certainly haven't used much. They are very light and soft. Apparently they used soft, low-density cardboard. Even with a very limited amount of primer I can already see them warping. I'm only giving them three stars because I love the square panels and they're not easy to find. I got some good art supplies from Ohuhu but unfortunately they failed. I can probably get them to work with careful layers of plaster or maybe sealer, but that's a lot of extra work.
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