Multicomponent pur composition

A method for applying a multicomponent composition to keratin material comprising:

• (a) applying a third component as a pretreatment to the keratin material to form pretreated keratin material;
• (b) applying first and second components sequentially or simultaneously or premixed to the pretreated keratin material;
• wherein:
• the first component comprises an organic polymer;
• the second component comprises an in situ linking material;
• the third component comprises a base compound;
• each of the first, second and third components comprise a medium;
• one or more of the first, second and third components comprise pigment particles;
• the organic polymer of the first component comprises units of a hydrophobic monomer and a hydrophilic monomer, wherein the hydrophobic monomer comprises a C1-C6 alkyl linear or branched (meth)acrylate monomer, styrene or a combination thereof wherein the styrene is present at a weight percentage amount of from none up to about 50 wt % relative to the total weight of the organic polymer;
• and the hydrophilic monomer comprises an olefinic acid selected from (meth)acrylic acid, and a hydroxyalkyl olefinic ester selected from hydroxymethyl or hydroxyethyl (meth)acrylate or any combination thereof,
• the organic polymer of the first component has a weight average molecular weight in the range of about 2 KDa to about 100 MDa;
• the acid number of the organic polymer of the first component is in a range of about 7 to about 90;
• the hydroxyalkyl olefinic ester portion of the organic polymer of the first component is in a range of about 1-5 wt % relative to the total weight of the organic polymer;
• the in situ linking material of the second component comprises hexamethylene diisocyanate, bis isocyanatocyclohexyl methane or uretdione hexamethylene diisocyanate;
• the base compound of the third component comprises linear polyethyleneimine or branched polyethylene imine wherein the base compound has a weight average molecular weight of about 150 Da to about 1 MDa;
• the molar ratio of isocyanate groups of the second component to hydroxyl groups of the first component is in a range of about 0.5:2 to 25:1.