I used Bilt hamber too, one large can (750 ml) split between the two sills with the flexi tube, a good warm or hot sunny day ideally so the metalwork is warm and I also warmed up the can in a jug of water (probably not needed, and not recommended by the manufacturer, so don't do it) I gradually worked my way along the sill using the drain holes and stopped when the excess dripped from the drain holes, leave if for a while to set then make sure the drain holes are not clogged, after all that's what they are there for.
|