The invention relates to a curtain coating process for coating substrates with a stable curtain and a uniform coaling at low flow rates wherein a free-falling curtain of an aqueous composition comprising a high solids content is coated onto the moving substrate at a flow rate per unit die length value (Q) equal to or inferior to 10 m/(s.m), the said high solids content composition comprising a polymeric methodology modifier and a non-ionic surfactant. The invention relates in particular to a curtain coating process for coaling fibrous substrates such as paper or board. The invention also relates to a coated product. BUTLER'S COURT,WATTLETON ROAD, BEACONSFIELD,BUCKINGHAMSHIRE HP91 RT U.K. ARJO WIGGINS FINE PAPERS LIMITED 3955/KOLNP/2006 A 3955/KOLNP/2006 INDIA 2009-03-20T07:58:00Z 2007-06-22 2006-12-29 302728 2005-07-27 PCT/GB2005/002947 D21H 23/ WO 2006/010927 BARCOCK, RICHARD,A, WARD-ASKEY,ANDREW 21737 0 717 U.K. 2004-07-29 0416900.9 2007-06-22 0 4yVxaOzO 2009-04-30T18:37:55Z 69140 BARCOCK, RICHARD,A, WARD-ASKEY,ANDREW 64081 ARJO WIGGINS FINE PAPERS