A thin glass fibre mat in a form similar to tissue paper. Supplied on a roll 1m wide and only 25-30 grams per m². During moulding it is used to cover up the coarse glass pattern produced by CSM. When sheathing It can be applied onto the CSM while the resin is still wet, again to cover the glass pattern and form a smooth surface for the flowcoat to be applied. Uses 100g of resin per m².