Hi Jo,
From what you wrote I understand you have recoated part or all of your floors.
Have you only treated part of the floors, or you have coated the entire area? Blisters may usually appear when:
- The coating is done directly onto the old finish without good cleaning of the surface and without using Bona Crosslinker - when recoating wooden floors at least buffing with a light screen is recommended before application
- Previous coats and new coats are not compatible - Bona is a water-based product - was the previous finish water-based or a compatible one?
This is basically a coat, which has a poor bond with the finish below. Unfortunately, I cannot think of an easy way of rectifying this without proper floor sanding and refinishing.