There may be machine marks on the model that require filling/sanding this can include minor warping. Check on Youtube for guides on how to finish a 3D printed model for painting as they will walk you through everything you need to know. Each model is throughly checked as part of Q/A and anything that cannot be easily fixed with model filler/milliput is not shipped.
The model takes a few days to print and while I have a standing stock, if multiple orders come through at once you may need to wait the full five days for the kit to be shipped.