This can be quite acute when building up several layers such as with a carriage side which left to its own devices will curl like a banana.
Many years ago I found a partial solution in the old-fashioned photo album - remember them?
Between sessions working on the pieces I store them on the sticky page beneath the cellophane, and then for good measure place the album at the bottom of a pile of heavy books, as if pressing flowers.
It might seem like overkill but it does make a difference, especially when you begin to laminate the piece.
If you have time to leave it for the styrene to fully cure you will find it stays pretty flat thereafter.
You can also reduce the tendency to curl by using something much more gentle like Limonene, but the downside is the joint takes much longer to bond, and pieces can move out of position while you’re handling the model.
Try Tamiya Extra Thin Cement. Not as aggressive as Mek but still good. Evaporats quickly so less chance of fingerprints. Doesn’t smell to much and no headaches.
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