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Paste quantity scales with roll count and paper weight: heavy vinyl needs about 30% more than standard paper, and paste-the-wall systems need more again because the whole wall is coated. Sizing an absorbent wall first uses extra diluted paste but greatly improves adhesion and slip.
Paste quantity
effective rolls = rolls x paper type factor; sachets = ceil(effective rolls / yield per sachet)
A coat of diluted paste applied to bare or porous plaster. It seals the surface so the paper slides into place instead of grabbing immediately.
The adhesive is spread across the whole wall area rather than the back of the paper, so overlap and edge coverage add to the total.