The packaging of Bond Flex XL ensures that consistent results are obtained with every mix. There is nothing to leave out, and, more importantly, nothing to add. Contractor error has been eliminated.
Although packaged in the same 16 litre bucket for a clean mix every time, for extra convenience Bond Flex XL is available in two different sizes. XL3 contains enough mixture for 3 litres of grout whilst XL6 contains two packs of each XL3 component and hence produce 6 litres of usable grout.