A core-shell microcapsule slurry comprising at least one microcapsule having a) an oil-based core; b) a polymeric shell formed by interfacial polymerisation in the presence of an anionic or amphiphilic biopolymer; and c) a coating comprising a cationic polymer; wherein the weight ratio between the biopolymer and the cationic polymer in the slurry is comprised between 0.2 and 20; wherein the anionic or amphiphilic biopolymer is selected from the group consisting of gum Arabic, soy protein, sodium caseinate, gelatin, bovine serum albumin, sugar beet pectin, hydrolyzed soy protein, hydrolyzed sericin, yeast extract mixture of hyaluronic acid and albumen and dextran sulfate, mixture of hydrolyzed wheat gluten and ceratonia siliqua carob gum and sodium dextran sulfate, a mixture of gum Arabic and glycoproteins and mixtures thereof; and wherein the cationic polymer is selected from the group consisting of dimethylallylammonium chloride homopolymer, copolymer of dimethyl diallyl ammonium chloride with acrylamide, hydroxypropyl trimethyl ammonium chloride ether of hydroxyethyl cellulose, quaternized copolymer of polyvinyl pyrrolidone and dimethylaminoethyl methacrylate, guar hydroxypropyl trimethyl ammonium chloride functionalized polysaccharide, quaternized chitosan, quaternized proteins, collagens, keratins, aminosilicones and mixtures thereof, or wherein the cationic polymer is selected from the group consisting of a cationic acrylic copolymer, a cationic homopolymer of diallyl dimethyl ammonium chloride, a cationic co-polymer of diallyl dimethyl ammonium chloride and acrylamide, a cationic hydroxyethyl cellulose, cationic guar gum, 2-hydroxy-3- (trimethylammonium)propyl ether chloride, laurdimonium hydroxypropyl hydrolysed collagen, hydrolysed wheat protein PG-propyl silanetriol, vinyl amine/vinyl alcohol copolymer, or cationic amino functional silicone, PEG- 7 amodimethicone and mixtures thereof. a) an oil-based core; b) a polymeric shell formed by interfacial polymerisation in the presence of an anionic or amphiphilic biopolymer; and c) a coating comprising a cationic polymer; wherein the weight ratio between the biopolymer and the cationic polymer in the slurry is comprised between 0.2 and 20; wherein the anionic or amphiphilic biopolymer is selected from the group consisting of gum Arabic, soy protein, sodium caseinate, gelatin, bovine serum albumin, sugar beet pectin, hydrolyzed soy protein, hydrolyzed sericin, yeast extract mixture of hyaluronic acid and albumen and dextran sulfate, mixture of hydrolyzed wheat gluten and ceratonia siliqua carob gum and sodium dextran sulfate, a mixture of gum Arabic and glycoproteins and mixtures thereof; and wherein the cationic polymer is selected from the group consisting of dimethylallylammonium chloride homopolymer, copolymer of dimethyl diallyl ammonium chloride with acrylamide, hydroxypropyl trimethyl ammonium chloride ether of hydroxyethyl cellulose, quaternized copolymer of polyvinyl pyrrolidone and dimethylaminoethyl methacrylate, guar hydroxypropyl trimethyl ammonium chloride functionalized polysaccharide, quaternized chitosan, quaternized proteins, collagens, keratins, aminosilicones and mixtures thereof, or wherein the cationic polymer is selected from the group consisting of a cationic acrylic copolymer, a cationic homopolymer of diallyl dimethyl ammonium chloride, a cationic co-polymer of diallyl dimethyl ammonium chloride and acrylamide, a cationic hydroxyethyl cellulose, cationic guar gum, 2-hydroxy-3- (trimethylammonium)propyl ether chloride, laurdimonium hydroxypropyl hydrolysed collagen, hydrolysed wheat protein PG-propyl silanetriol, vinyl amine/vinyl alcohol copolymer, or cationic amino functional silicone, PEG- 7 amodimethicone and mixtures thereof.