Foliar feeding is one of my staples for growing in veg (and through week 2 after 12/12). It will breathe life into your plants and set them up for vigorous, healthy growth. I mainly foliar compost teas, for IPM (neem/Castile soap), or to rapidly address micronutrient issues.
That said, you still MUST control humidity and provide plenty of airflow. Without strong air turnover, I would say do NOT foliar.