Opus Easytard Gel is a biodegradable aqueous gel type Product. Its rheological characteristics enable it to provide a product which may be brushed onto mould surfaces to provide a uniform coating of retardant. Opus Easytard Gel may be applied to complex shaped moulds and vertical surfaces ensuring a uniform coating free from ‘runs’. Opus Easytard Gel is ideally suited for the production of exposed aggregate finishes or for the purpose of producing a surface suitable for keying construction joints at stop ends, or for subsequent plastering operations. Opus Easytard Gel is coloured green as a visual guide when painting the moulds so as to assist in uniform application.