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Airhead
Thanks all for the replies.
TBH I don’t think 18mm marine ply is going to flex: it’s only 400 x 1300 (landscape) and the weight is going to be supported by five brackets that will catch the bottom edge of the 18mm ply, the ceramics slightly lap over the ply so that the ply and also any hanging/mounting hardware won’t be visible. I reckon the total weight of the tiles is closer to 20-25kg all in and it is a sheer weight and I think pretty unlikely to flex in any significant way. I’m going to use as flexible an adhesive as I can find so hopefully that mitigates any flex. Need to look into a latex primer too, I’ve keyed the ply with some criss-cross scratches as you’d do between a scratch coat and plastering.
The reason I said about batons on the back is because that is often how unframed/unglazed paintings are transported - the batons/oz clips then screw into a timber “travel frame” that is larger and deeper than the painting though maybe you already know this if you have worked in similar fields