Does it matter if one side of the panel is painted/veneer and the other side isn’t?

Yes – panels must be balanced. If a panel is not painted, sealed or veneered equally on both faces, the panel is considered unbalanced and is likely to distort, cup or twist, exerting tremendous pressure on the mounting system. This can lead to the centre of large panels ‘popping’ off as the clips struggle to withstand this cupping or warping pressure. Sealing or veneering both sides so that the panel is structurally stable is good practice. Fastmount can provide advice but is not responsible for the unclipping of clips due to distorted panels.