In some cases, you may simply have to wait a few more days for the paint to even out. In some cases, the painters may have applied the paint unevenly and a re-do is needed to correct the mistake. Still, in other cases an uneven paint job may be the result of condensation forming on the painted surface, especially if you paint the house in the late afternoon shortly before the sun goes down. You or your painters should try to get started in the morning to give the sun enough time to dry the paint before condensation starts to form after sunset. A second coat a day later may help things even out, too.