COVERAGE A 20kg bag of STOPGAP 1200 Powder mixed with 5.0 litres of STOPGAP 1200 Liquid will cover approximately 5.0m² at a thickness of 2 - 3mm. STOPGAP 1200 is a low odour, fast setting, fast drying, two component smoothing underlayment suitable for preparing sound internal subfloors prior to the installation of new floorcoverings. STOPGAP 1200 is particularly suitable for use over old adhesive residues (including bitumen and carpet tile tackifiers) without the need for priming. STOPGAP 1200 can be used for patch filling timber floors prior to overlaying with plywood. It is suitable for use in clinical and biologically sensitive areas such as hospitals, laboratories, clean rooms etc.