Attempting to seal the underside of my 3 tap boxes with expanding foam and another expensive sealant, as mains water man is worried about rats burrowing underneath and making a nest ( ). Anyway, the sealant has the look and consistancy of Nutella and is about as equally as effective. Thanks to the severely cramped conditions in the hole I'm getting covered in the stuff, and using the foam applicator is no less messy. To top it all it's about minus 7 outside and beginning to snow!