I wouldn't have bought the car if I'd have known about it being resprayed given its age and mileage.

If you expect dealers to tell you about every repair a car has had in the past then you are being very naive. Presuming you did not have the opportunity to see the car before buying it you would have had the opportunity to check it over on delivery and then reject it based on the poor repairs. And since most of these sellers have a 14 day return policy surely you would have spotted it during that period if it was so bad.

You are probably out of options now and can only hope the paint repair does not fail. But IMHO if they could not be bothered to mask or clean up properly after there is little chance they prepped the area properly before paint thus I would expect issues at some point.

Cheap nasty paint job.

It almost certainly will deteriorate.. If they could not be bothered to finsh it properly, why do you think they will have prepared it properly before painting?

If you are not happy with the finish complain to the dealer? Presumably you have some warranty, may be in the Manufacturers warranty? you do not say where or when you bought it which would be helpful. You may even be covered by the sale of good act The price you paid is irrelevant if you were not told it had been damaged before you bought it