I'm going to be doing a GRP/Fibreglass roof in the next couple of weeks and i'm getting everything together that I need. Can you tell me what the smaller rolls of fibreglass bandage are for and what would I use it for?

The fibreglass bandage is used on a roof to strengthen the joints between the edge trims and the main Fibrelast Basecoat layer, it's also applied to the OSB3 decking joints although you don't need to do this if you've used tongue and groove decking.