Coating including primer

A method of coating a substrate (A), said method comprising the steps of

• a) providing a substrate (A), said substrate (A) comprising at least a first type of chemical groups, at least a fraction of the first type of chemical groups is at the surface of the substrate (A),
• b) applying a layer (B) of a first mixture on the surface of the substrate (A), said first mixture comprising a compound comprising at least a second type of chemical groups, wherein the first type of chemical groups have the ability to react with the second type of chemical groups to form a covalent bond (C),
• c) initiating a reaction to form the covalent bond (C) by reaction of the first type of chemical groups and the second type of chemical groups, wherein a reacted layer of a reacted first mixture is formed from the first mixture, wherein the reacted first mixture excludes those molecules of the compound that comprise at least the second type of chemical groups which are covalently bound to the substrate,
• d) applying a layer (D) of a second mixture on the reacted layer of the reacted first mixture with the reacted first mixture and the second mixture diffusively mixing so that the concentration calculated by weight of any compound in the reacted layer of the reacted first mixture deviates at most 10% from the concentration of the same compound calculated in both the reacted layer of the reacted first mixture and the layer of the second mixture taken together, within 1 minute after application of the layer (D) of the second mixture at 20° C.,
• e) curing the resulting mixture of the reacted first mixture and the second mixture to form a coating.