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Originally Posted by mpg_numbers_guy
Any issues with warping today?
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Yup. But I am not entirely surprised. Polyester takes forever to cure it seems. So far it is not really serious warping, but...
Clearly there needs to be extended curing time (like a month) or some sort of structure or reinforcement within the piece. Such issues make the material less appealing. Basically, it wants to expand in the heat of the sun, and so it warps. The cardboard underside might not be helping, but I remember a previous piece I made for the interior and as soon as I took the cardboard off (soaking in water) the piece warped without heat.
Maybe multiple layers would help?