an acrylic caulk may not fully cure or fail if it isn't designed for wet locations. Also, since some caulks can take up to a week or so to fully cure, you may have gotten it wet too soon. The outside would be cured, but the inside is not. I'd consider a full silicon caulk rather than acrylic. My unprofessional opinion. May sure to read the instructions and allow it to cure fully before getting it all wet.