Can You Use Flex Seal to waterproof a basement?
Similarly one may ask, can you waterproof a basement from the inside?
DO apply a masonry waterproofing product to bare interior basement walls. If your foil test showed that water is soaking through your basement walls and leaving them wet, seal the interior of the walls with a high-quality waterproof paint, such as DRYLOK White Extreme Waterproofer (available from Home Depot).
Additionally, does Flex Seal adhere to concrete?
It will adhere to almost any surface such as porcelain, wood, metal, tile, concrete, masonry, fabric, glass, plastic, aluminum, drywall, vinyl, rubber, cement and just about any other wet (it works best on dry and clean surfaces even though it can be used on wet surface) or dry surface.
The average cost to waterproof a basement is $1,920 to $6,320, or between $3 and $9 per square foot for materials and labor. Interior basement repairs that don't require excavation cost around $500 to $1,500, whereas large extensive repairs with drainage and foundation issues run $10,000 or more.