The skeleton material is PP, which is not sticky with PU. It needs to be treated between the skeleton and Pu: 1. Brush the primer 2. Paste double-sided adhesive tape, but the product and framework in the red wire frame are too thin at the edge, so paste double-sided adhesive tape can't be pasted at the most edge (double-sided adhesive tape will appear on the Pu surface after uneven foaming). If not pasted to the edge, the foaming Pu will not stick to the framework, and the non stick Pu here will shrink, resulting in the broken during coating, so the bottom coating can only be used for this place.<br>
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