My basement floor is seeping water through the hairline crack during heavy rain. Should I use Sikaflex Crack Flex Sealant? Do I need to open up the crack so the sealant can get in?
You can use Sikaflex Crack Flex Sealant for your application. Please note that if the hydrostatic pressure is great, the sealant may fail. This would be the result with any sealant. The minimum depth and width requirement of the crack must be at least 1/4" x 1/4". If the crack does not meet this requirement, you can use a chisel and hammer to widen it. (The information applies to Sikaflex+ Crack Flex Sealant product line).