Mapei Mapenet 150 is a professional alkali-resistant glass-fibre reinforcing mesh that embeds into plaster, skim coats, waterproofing membranes and external wall insulation systems. It acts as a hidden "skeleton" that holds the coating together, spreads stress and dramatically reduces cracking — for a stronger, longer-lasting finish inside and out.Its special alkali-resistant primer lets the mesh keep its strength inside cement and mortar, where ordinary fibreglass would break down. The easy-to-..